LINK<\/strong><\/a><\/p>\n\n\n\n“Radionuclide activities were measured in the low\u2010background gamma\u2010ray spectrometry facility GeMSE in eight meteorite falls (Lost City, Tamdakht, Huaxi, Boumdeid, Xining, Kamargaon, Degtevo, and Ouidiyat Sbaa) and two finds (SaU 606 and M\u00fcrtschenstock) to evaluate the use of radionuclides for terrestrial age estimates. Results indicate that these meteorites were all derived from small\u2010 (r < 25 cm) to medium\u2010sized (r < 65 cm) meteoroids. Short\u2010lived 48V (t1\/2 = 16.0 d) and 51Cr (t1\/2 = 27.7 d) were only detected in Oudiyat Sbaa (EH), while 7Be (t1\/2 = 53.1 d) was also detected in Degtevo (H) and Kamargaon (L), in agreement with reported fall dates. The 22Na\/26Al activity ratio in Huaxi agrees with the previously reported short cosmic\u2010ray exposure age of this meteorite while 22Na\/26Al in Kamargaon likely records a complex exposure history. Bayesian statistical analysis verifies the detection of very low activities of 44Ti (t1\/2 = 60 a) in the relatively large H chondrites (>100 g) Degtevo, Huaxi, Tamdakht, Lost City, and SaU 606. Additionally, large samples from Oudiyat Sbaa (EH) and Kamargaon (L) gave positive detections. For H chondrite target compositions, detected 44Ti(Fe+Ni)\/26Al averaged 0.055 \u00b1 0.013. Activities of 22Na and 54Mn in SaU 606 show that this meteorite fell between July and September 2012, making SaU 606 the second recent fall from Oman identified using gamma\u2010ray spectrometry. The upper activity limit of 22Na in the M\u00fcrtschenstock meteorite shows that it fell prior to 1999 and is not related to a bolide observation in 2015. M\u00fcrtschenstock shows 137Cs ~10\u00d7 higher than previously determined in Oman meteorites, likely due to Chernobyl fallout.”<\/p>\n","protected":false},"excerpt":{"rendered":"
\u00c5ke V. Ros\u00e9n, Beda A. Hofmann, Moritz von Sivers, Marc Schumann Meteoritics & Planetary Science First Published: 19 December 2019 LINK “Radionuclide activities were measured in the low\u2010background gamma\u2010ray spectrometry facility GeMSE in eight meteorite…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[69,25,6,23,7,68,70,47],"tags":[5265,5351,3265,1146,5350,1147,1089,1849,3685,2419,3692,3599,4478,141,5349,5348,400,5346,601,1800],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20973"}],"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=20973"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20973\/revisions"}],"predecessor-version":[{"id":20975,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/20973\/revisions\/20975"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=20973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=20973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=20973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}