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	<title>Polonium - Revision history</title>
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	<updated>2026-05-22T03:07:33Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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		<title>imported&gt;Citation bot: Altered journal. | Use this bot. Report bugs. | Suggested by Abductive | #UCB_toolbar</title>
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		<updated>2025-12-25T02:58:13Z</updated>

		<summary type="html">&lt;p&gt;Altered journal. | &lt;a href=&quot;/wiki143/index.php?title=En:WP:UCB&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;En:WP:UCB (page does not exist)&quot;&gt;Use this bot&lt;/a&gt;. &lt;a href=&quot;/wiki143/index.php?title=En:WP:DBUG&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;En:WP:DBUG (page does not exist)&quot;&gt;Report bugs&lt;/a&gt;. | Suggested by Abductive | #UCB_toolbar&lt;/p&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Previous revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 02:58, 25 December 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l125&quot;&gt;Line 125:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 125:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;In 1934, an experiment showed that when natural [[bismuth-209|&amp;lt;sup&amp;gt;209&amp;lt;/sup&amp;gt;Bi]] is bombarded with [[neutron]]s, &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Bi is created, which then decays to &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po via beta-minus decay. By irradiating certain bismuth salts containing light element nuclei such as beryllium, a cascading (α,n) reaction can also be induced to produce &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po in large quantities.&amp;lt;ref&amp;gt;{{cite journal |title =Neutronic Chain Reactions for Polonium-210 Production |first =Solomon |last = Lim |journal = SSRN |date = 2023 |doi = 10.2139/ssrn.4469519|arxiv =2307.04825 |s2cid =264176122 |url =https://hal.science/hal-04196973/file/Report%20210.pdf }}&amp;lt;/ref&amp;gt; The final purification is done pyrochemically followed by liquid-liquid extraction techniques.&amp;lt;ref&amp;gt;{{cite journal |title =Pyrochemical Extraction of Polonium from Irradiated Bismuth Metal |first =Wallace W. |last = Schulz |author2 = Schiefelbein, Gary F. |author3 = Bruns, Lester E. |journal = Ind. Eng. Chem. Process Des. Dev. |date = 1969 |volume = 8 |issue = 4 |pages= 508–515| doi = 10.1021/i260032a013}}&amp;lt;/ref&amp;gt; Polonium may now be made in milligram amounts in this procedure which uses high neutron fluxes found in [[nuclear reactor]]s.&amp;lt;ref name=&amp;quot;g249&amp;quot; /&amp;gt; Only about 100&amp;amp;nbsp;grams are produced each year, practically all of it in Russia, making polonium exceedingly rare.&amp;lt;ref&amp;gt;{{cite web |title = Q&amp;amp;A: Polonium-210 |url =http://www.rsc.org/chemistryworld/News/2006/November/27110601.asp |publisher = RSC Chemistry World |date = 2006-11-27 |access-date =2009-01-12}}&amp;lt;/ref&amp;gt;&amp;lt;ref&amp;gt;{{cite web |date=2007-01-11 |title=Most Polonium Made Near the Volga River |url=https://www.themoscowtimes.com/archive/most-polonium-made-near-the-volga-river |publisher=The Moscow Times – News}}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;In 1934, an experiment showed that when natural [[bismuth-209|&amp;lt;sup&amp;gt;209&amp;lt;/sup&amp;gt;Bi]] is bombarded with [[neutron]]s, &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Bi is created, which then decays to &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po via beta-minus decay. By irradiating certain bismuth salts containing light element nuclei such as beryllium, a cascading (α,n) reaction can also be induced to produce &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po in large quantities.&amp;lt;ref&amp;gt;{{cite journal |title =Neutronic Chain Reactions for Polonium-210 Production |first =Solomon |last = Lim |journal = SSRN |date = 2023 |doi = 10.2139/ssrn.4469519|arxiv =2307.04825 |s2cid =264176122 |url =https://hal.science/hal-04196973/file/Report%20210.pdf }}&amp;lt;/ref&amp;gt; The final purification is done pyrochemically followed by liquid-liquid extraction techniques.&amp;lt;ref&amp;gt;{{cite journal |title =Pyrochemical Extraction of Polonium from Irradiated Bismuth Metal |first =Wallace W. |last = Schulz |author2 = Schiefelbein, Gary F. |author3 = Bruns, Lester E. |journal = Ind. Eng. Chem. Process Des. Dev. |date = 1969 |volume = 8 |issue = 4 |pages= 508–515| doi = 10.1021/i260032a013}}&amp;lt;/ref&amp;gt; Polonium may now be made in milligram amounts in this procedure which uses high neutron fluxes found in [[nuclear reactor]]s.&amp;lt;ref name=&amp;quot;g249&amp;quot; /&amp;gt; Only about 100&amp;amp;nbsp;grams are produced each year, practically all of it in Russia, making polonium exceedingly rare.&amp;lt;ref&amp;gt;{{cite web |title = Q&amp;amp;A: Polonium-210 |url =http://www.rsc.org/chemistryworld/News/2006/November/27110601.asp |publisher = RSC Chemistry World |date = 2006-11-27 |access-date =2009-01-12}}&amp;lt;/ref&amp;gt;&amp;lt;ref&amp;gt;{{cite web |date=2007-01-11 |title=Most Polonium Made Near the Volga River |url=https://www.themoscowtimes.com/archive/most-polonium-made-near-the-volga-river |publisher=The Moscow Times – News}}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;This process can cause problems in [[Lead-bismuth eutectic|lead-bismuth]] based [[Liquid metal cooled reactor|liquid metal cooled nuclear reactors]] such as those used in the [[Soviet Navy]]&#039;s [[Soviet submarine K-27|K-27]]. Measures must be taken in these reactors to deal with the unwanted possibility of &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po being released from the coolant.&amp;lt;ref&amp;gt;{{cite journal|title=Long-lived radionuclides of sodium, lead-bismuth, and lead coolants in fast-neutron reactors|journal=Atomic Energy|volume =87|issue=3 |year=1999|pages=658–662|doi=10.1007/BF02673579|last1=Usanov|first1=V. I.|last2=Pankratov|first2=D. V.|last3=Popov|first3=É. P.|last4=Markelov|first4=P. I.|last5=Ryabaya|first5=L. D.|last6=Zabrodskaya|first6=S. V.|s2cid=94738113}}&amp;lt;/ref&amp;gt;&amp;lt;ref&amp;gt;{{cite journal|author=Naumov, V. V. |date=November 2006|url=http://www.antiatom.ru/2006_12-11.php|script-title=ru:За какими корабельными реакторами будущее?|language=ru|journal= Атомная &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;стратегия &lt;/del&gt;|volume= 26}}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;This process can cause problems in [[Lead-bismuth eutectic|lead-bismuth]] based [[Liquid metal cooled reactor|liquid metal cooled nuclear reactors]] such as those used in the [[Soviet Navy]]&#039;s [[Soviet submarine K-27|K-27]]. Measures must be taken in these reactors to deal with the unwanted possibility of &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po being released from the coolant.&amp;lt;ref&amp;gt;{{cite journal|title=Long-lived radionuclides of sodium, lead-bismuth, and lead coolants in fast-neutron reactors|journal=Atomic Energy|volume =87|issue=3 |year=1999|pages=658–662|doi=10.1007/BF02673579|last1=Usanov|first1=V. I.|last2=Pankratov|first2=D. V.|last3=Popov|first3=É. P.|last4=Markelov|first4=P. I.|last5=Ryabaya|first5=L. D.|last6=Zabrodskaya|first6=S. V.|s2cid=94738113}}&amp;lt;/ref&amp;gt;&amp;lt;ref&amp;gt;{{cite journal|author=Naumov, V. V. |date=November 2006|url=http://www.antiatom.ru/2006_12-11.php|script-title=ru:За какими корабельными реакторами будущее?|language=ru|journal= Атомная &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Стратегия &lt;/ins&gt;|volume= 26}}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The longer-lived isotopes of polonium, &amp;lt;sup&amp;gt;208&amp;lt;/sup&amp;gt;Po and &amp;lt;sup&amp;gt;209&amp;lt;/sup&amp;gt;Po, can be formed by [[proton]] or [[deuteron]] bombardment of bismuth using a [[cyclotron]]. Other more neutron-deficient and more unstable isotopes can be formed by the irradiation of platinum with [[carbon]] nuclei.&amp;lt;ref&amp;gt;{{cite journal| author = Atterling, H.| author2 = Forsling, W. |title = Light Polonium Isotopes from Carbon Ion Bombardments of Platinum |journal = Arkiv för Fysik |volume = 15| issue = 1 |pages = 81–88 |date = 1959 |osti =4238755}}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The longer-lived isotopes of polonium, &amp;lt;sup&amp;gt;208&amp;lt;/sup&amp;gt;Po and &amp;lt;sup&amp;gt;209&amp;lt;/sup&amp;gt;Po, can be formed by [[proton]] or [[deuteron]] bombardment of bismuth using a [[cyclotron]]. Other more neutron-deficient and more unstable isotopes can be formed by the irradiation of platinum with [[carbon]] nuclei.&amp;lt;ref&amp;gt;{{cite journal| author = Atterling, H.| author2 = Forsling, W. |title = Light Polonium Isotopes from Carbon Ion Bombardments of Platinum |journal = Arkiv för Fysik |volume = 15| issue = 1 |pages = 81–88 |date = 1959 |osti =4238755}}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l159&quot;&gt;Line 159:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 159:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;=== Regulatory exposure limits and handling ===&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;=== Regulatory exposure limits and handling ===&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The maximum allowable body burden for ingested &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po is only {{convert|1.1|kBq|nCi|abbr=on}}, which is equivalent to a particle massing only 6.8 picograms.&amp;lt;ref&amp;gt;{{Cite journal |last1=Boryło |first1=Alicja |last2=Skwarzec |first2=Bogdan |last3=Wieczorek |first3=Jarosław |date=2022-02-10 |title=Sources of polonium &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po and radio-lead &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Pb in human body in Poland |journal=International Journal of Environmental Research and Public Health |language=en |volume=19 |issue=4 |pages=1984 |doi=10.3390/ijerph19041984 |doi-access=free |issn=1660-4601 |pmc=8872270 |pmid=35206170}}&amp;lt;/ref&amp;gt; The maximum permissible workplace concentration of airborne &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po is about 10&amp;amp;nbsp;Bq/m&amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt; ({{val|3|e=-10}}&amp;amp;nbsp;μCi/cm&amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt;).&amp;lt;ref&amp;gt;{{cite web |url = https://www.nrc.gov/reading-rm/doc-collections/cfr/part020/appb/Polonium-210.html |title = Nuclear Regulatory Commission limits for &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po| date = 2008-12-12 |access-date = 2009-01-12 |publisher = U.S. NRC}}&amp;lt;/ref&amp;gt; The target organs for polonium in humans are the [[spleen]] and [[liver]].&amp;lt;ref&amp;gt;{{cite web | url =http://www.pilgrimwatch.org/health1.html | title =PilgrimWatch – Pilgrim Nuclear – Health Impact | access-date =2009-05-05 | archive-url =https://web.archive.org/web/20090105192000/http://www.pilgrimwatch.org/health1.html | archive-date =2009-01-05 | url-status =dead }}&amp;lt;/ref&amp;gt; As the spleen (150&amp;amp;nbsp;g) and the liver (1.3 to 3&amp;amp;nbsp;kg) are much smaller than the rest of the body, if the polonium is concentrated in these vital organs, it is a greater threat to life than the dose which would be suffered (on average) by the whole body if it were spread evenly throughout the body, in the same way as [[caesium]] or [[tritium]] (as T&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O).&amp;lt;ref&amp;gt;{{cite journal| last1=Moroz|first1=B. B.| last2=Parfenov|first2=Yu. D.| year=1972| title=Metabolism and biological effects of polonium-210| journal=Atomic Energy Review| volume=10| issue=23| pages=175–232| url=https://inis.iaea.org/search/search.aspx?orig_q=RN:53061794}}&amp;lt;/ref&amp;gt;&amp;lt;ref&amp;gt;{{Cite journal |last1=Jefferson |first1=Robert D. |last2=Goans |first2=Ronald E. |last3=Blain |first3=Peter G. |last4=Thomas |first4=Simon H.L. |date=2009 |title=Diagnosis and treatment of polonium poisoning |url=http://www.tandfonline.com/doi/full/10.1080/15563650902956431 |journal=Clinical Toxicology |language=en |volume=47 |issue=5 |pages=379–392 |doi=10.1080/15563650902956431 |pmid=19492929 |issn=1556-3650|url-access=subscription }}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The maximum allowable body burden for ingested &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po is only {{convert|1.1|kBq|nCi|abbr=on}}, which is equivalent to a particle massing only 6.8 picograms.&amp;lt;ref&amp;gt;{{Cite journal |last1=Boryło |first1=Alicja |last2=Skwarzec |first2=Bogdan |last3=Wieczorek |first3=Jarosław |date=2022-02-10 |title=Sources of polonium &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po and radio-lead &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Pb in human body in Poland |journal=International Journal of Environmental Research and Public Health |language=en |volume=19 |issue=4 |pages=1984 |doi=10.3390/ijerph19041984 |doi-access=free |issn=1660-4601 |pmc=8872270 |pmid=35206170 &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;|bibcode=2022IJERP..19.1984B &lt;/ins&gt;}}&amp;lt;/ref&amp;gt; The maximum permissible workplace concentration of airborne &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po is about 10&amp;amp;nbsp;Bq/m&amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt; ({{val|3|e=-10}}&amp;amp;nbsp;μCi/cm&amp;lt;sup&amp;gt;3&amp;lt;/sup&amp;gt;).&amp;lt;ref&amp;gt;{{cite web |url = https://www.nrc.gov/reading-rm/doc-collections/cfr/part020/appb/Polonium-210.html |title = Nuclear Regulatory Commission limits for &amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po| date = 2008-12-12 |access-date = 2009-01-12 |publisher = U.S. NRC}}&amp;lt;/ref&amp;gt; The target organs for polonium in humans are the [[spleen]] and [[liver]].&amp;lt;ref&amp;gt;{{cite web | url =http://www.pilgrimwatch.org/health1.html | title =PilgrimWatch – Pilgrim Nuclear – Health Impact | access-date =2009-05-05 | archive-url =https://web.archive.org/web/20090105192000/http://www.pilgrimwatch.org/health1.html | archive-date =2009-01-05 | url-status =dead }}&amp;lt;/ref&amp;gt; As the spleen (150&amp;amp;nbsp;g) and the liver (1.3 to 3&amp;amp;nbsp;kg) are much smaller than the rest of the body, if the polonium is concentrated in these vital organs, it is a greater threat to life than the dose which would be suffered (on average) by the whole body if it were spread evenly throughout the body, in the same way as [[caesium]] or [[tritium]] (as T&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O).&amp;lt;ref&amp;gt;{{cite journal| last1=Moroz|first1=B. B.| last2=Parfenov|first2=Yu. D.| year=1972| title=Metabolism and biological effects of polonium-210| journal=Atomic Energy Review| volume=10| issue=23| pages=175–232| url=https://inis.iaea.org/search/search.aspx?orig_q=RN:53061794}}&amp;lt;/ref&amp;gt;&amp;lt;ref&amp;gt;{{Cite journal |last1=Jefferson |first1=Robert D. |last2=Goans |first2=Ronald E. |last3=Blain |first3=Peter G. |last4=Thomas |first4=Simon H.L. |date=2009 |title=Diagnosis and treatment of polonium poisoning |url=http://www.tandfonline.com/doi/full/10.1080/15563650902956431 |journal=Clinical Toxicology |language=en |volume=47 |issue=5 |pages=379–392 |doi=10.1080/15563650902956431 |pmid=19492929 |issn=1556-3650|url-access=subscription }}&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po is widely used in industry, and readily available with little regulation or restriction.&amp;lt;ref name=&amp;quot;Zimmerman&amp;quot;/&amp;gt;&amp;lt;ref&amp;gt;{{Cite journal|last1=Bastian|first1=R.K.|last2=Bachmaier|first2=J.T.|last3=Schmidt|first3=D.W.|last4=Salomon|first4=S.N.|last5=Jones|first5=A.|last6=Chiu|first6=W.A.|last7=Setlow|first7=L.W.|last8=Wolbarst|first8=A.W.|last9=Yu|first9=C.|date=2004-01-01|title=Radioactive Materials in Biosolids: National Survey, Dose Modeling &amp;amp; POTW Guidance|journal=Proceedings of the Water Environment Federation|volume=2004|issue=1|pages=777–803|doi=10.2175/193864704784343063|doi-broken-date=1 July 2025 | url=https://www.researchgate.net/publication/314571422}}&amp;lt;/ref&amp;gt; In the US, a tracking system run by the Nuclear Regulatory Commission was implemented in 2007 to register purchases of more than {{convert|16|Ci}} of polonium-210 (enough to make up 5,000 lethal doses). The IAEA &amp;quot;is said to be considering tighter regulations&amp;amp;nbsp;... There is talk that it might tighten the polonium reporting requirement by a factor of 10, to {{convert|1.6|Ci}}.&amp;quot;&amp;lt;ref name=&amp;quot;Zimmerman&amp;quot;&amp;gt;{{cite news |url=https://www.nytimes.com/2006/12/19/opinion/19zimmerman.html |title=Opinion: The Smoky Bomb Threat |access-date=2006-12-19 |newspaper=The New York Times |first=Peter D. |last=Zimmerman|date=2006-12-19}}&amp;lt;/ref&amp;gt; As of 2013, this is still the only alpha emitting byproduct material available, as a NRC Exempt Quantity, which may be held without a radioactive material license.{{citation needed|date=September 2013}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;sup&amp;gt;210&amp;lt;/sup&amp;gt;Po is widely used in industry, and readily available with little regulation or restriction.&amp;lt;ref name=&amp;quot;Zimmerman&amp;quot;/&amp;gt;&amp;lt;ref&amp;gt;{{Cite journal|last1=Bastian|first1=R.K.|last2=Bachmaier|first2=J.T.|last3=Schmidt|first3=D.W.|last4=Salomon|first4=S.N.|last5=Jones|first5=A.|last6=Chiu|first6=W.A.|last7=Setlow|first7=L.W.|last8=Wolbarst|first8=A.W.|last9=Yu|first9=C.|date=2004-01-01|title=Radioactive Materials in Biosolids: National Survey, Dose Modeling &amp;amp; POTW Guidance|journal=Proceedings of the Water Environment Federation|volume=2004|issue=1|pages=777–803|doi=10.2175/193864704784343063|doi-broken-date=1 July 2025 | url=https://www.researchgate.net/publication/314571422}}&amp;lt;/ref&amp;gt; In the US, a tracking system run by the Nuclear Regulatory Commission was implemented in 2007 to register purchases of more than {{convert|16|Ci}} of polonium-210 (enough to make up 5,000 lethal doses). The IAEA &amp;quot;is said to be considering tighter regulations&amp;amp;nbsp;... There is talk that it might tighten the polonium reporting requirement by a factor of 10, to {{convert|1.6|Ci}}.&amp;quot;&amp;lt;ref name=&amp;quot;Zimmerman&amp;quot;&amp;gt;{{cite news |url=https://www.nytimes.com/2006/12/19/opinion/19zimmerman.html |title=Opinion: The Smoky Bomb Threat |access-date=2006-12-19 |newspaper=The New York Times |first=Peter D. |last=Zimmerman|date=2006-12-19}}&amp;lt;/ref&amp;gt; As of 2013, this is still the only alpha emitting byproduct material available, as a NRC Exempt Quantity, which may be held without a radioactive material license.{{citation needed|date=September 2013}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>imported&gt;Citation bot</name></author>
	</entry>
	<entry>
		<id>http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;diff=3131659&amp;oldid=prev</id>
		<title>imported&gt;Harold Foppele: /* Compounds */ Added Polonium dichloride dibromide</title>
		<link rel="alternate" type="text/html" href="http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;diff=3131659&amp;oldid=prev"/>
		<updated>2025-11-16T22:48:32Z</updated>

		<summary type="html">&lt;p&gt;&lt;span class=&quot;autocomment&quot;&gt;Compounds: &lt;/span&gt; Added &lt;a href=&quot;/wiki143/index.php?title=Polonium_dichloride_dibromide&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;Polonium dichloride dibromide (page does not exist)&quot;&gt;Polonium dichloride dibromide&lt;/a&gt;&lt;/p&gt;
&lt;a href=&quot;http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;amp;diff=3131659&amp;amp;oldid=726092&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>imported&gt;Harold Foppele</name></author>
	</entry>
	<entry>
		<id>http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;diff=726092&amp;oldid=prev</id>
		<title>imported&gt;Quondum: u → Da</title>
		<link rel="alternate" type="text/html" href="http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;diff=726092&amp;oldid=prev"/>
		<updated>2025-06-21T00:41:48Z</updated>

		<summary type="html">&lt;p&gt;u → Da&lt;/p&gt;
&lt;a href=&quot;http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;amp;diff=726092&amp;amp;oldid=15261&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>imported&gt;Quondum</name></author>
	</entry>
	<entry>
		<id>http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;diff=15261&amp;oldid=prev</id>
		<title>imported&gt;GreenC bot: Move 1 url. Wayback Medic 2.5 per WP:URLREQ#fda.gov</title>
		<link rel="alternate" type="text/html" href="http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;diff=15261&amp;oldid=prev"/>
		<updated>2025-05-29T21:55:24Z</updated>

		<summary type="html">&lt;p&gt;Move 1 url. &lt;a href=&quot;/wiki143/index.php?title=User:GreenC/WaybackMedic_2.5&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;User:GreenC/WaybackMedic 2.5 (page does not exist)&quot;&gt;Wayback Medic 2.5&lt;/a&gt; per &lt;a href=&quot;/wiki143/index.php?title=WP:URLREQ&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;WP:URLREQ (page does not exist)&quot;&gt;WP:URLREQ#fda.gov&lt;/a&gt;&lt;/p&gt;
&lt;a href=&quot;http://debianws.lexgopc.com/wiki143/index.php?title=Polonium&amp;amp;diff=15261&quot;&gt;Show changes&lt;/a&gt;</summary>
		<author><name>imported&gt;GreenC bot</name></author>
	</entry>
</feed>