{"id":22518,"date":"2020-07-01T02:12:52","date_gmt":"2020-07-01T00:12:52","guid":{"rendered":"http:\/\/karmaka.de\/?p=22518"},"modified":"2020-07-01T02:12:54","modified_gmt":"2020-07-01T00:12:54","slug":"iupac-iugs-recommendation-on-the-half-lives-of-147sm-and-146sm","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=22518","title":{"rendered":"IUPAC-IUGS recommendation on the half-lives of 147Sm and 146Sm"},"content":{"rendered":"\n<p>IUPAC-IUGS recommendation on the half-lives of 147Sm and 146Sm<\/p>\n\n\n\n<p>I.M. Villa, N.E. Holden, A. Possolo, R.B. Ickert, D.B. Hibbert, P.R. Renne<\/p>\n\n\n\n<p>Geochimica et Cosmochimica Acta<br>In Press, Journal Pre-proof, Available online 30 June 2020<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0016703720303823\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The IUPAC-IUGS joint Task Group \u201cIsotopes in Geosciences\u201d recommends a value of (106.25 \u00b1 0.38) Ga for the half-life of 147Sm, and a corresponding decay constant \u03bb147 = (6.524 \u00b1 0.024) \u00d7 10-12 a-1, both with a coverage factor k = 2. For the extinct radionuclide 146Sm two very different half-lives are used in the scientific community (c. 68 and 103 Ma), to such a degree that no consensus value can be endorsed at present by the Task Group. Pending dedicated re-investigations it is recommended that papers using the 146Sm decay to quantify the cosmo\/geological evolution of (extra)terrestrial samples perform a twin set of calculations using both proposed half-lives.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>IUPAC-IUGS recommendation on the half-lives of 147Sm and 146Sm I.M. Villa, N.E. Holden, A. Possolo, R.B. Ickert, D.B. Hibbert, P.R. Renne Geochimica et Cosmochimica ActaIn Press, Journal Pre-proof, Available online 30 June 2020 LINK &#8220;The&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1598,68],"tags":[501,471,1848],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22518"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=22518"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22518\/revisions"}],"predecessor-version":[{"id":22519,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/22518\/revisions\/22519"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=22518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=22518"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=22518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}