Extinct Be-10 in type a calcium-aluminum-rich inclusions from CV chondrites

摘要

We have found clear evidence of live Be-10 in five normal Type A Calcium-aluminum-rich inclusions (CAIs), one normal Type B CAI, and one FUN Type A CAI, all from CV3 chondrites. The (Be-10/Be-9)(0) ratios range from similar to0.36 X 10(-3) to similar to0.77 X 10(-3) and are similar to those found by previous workers. The (Be-10/Be-9)(0) ratios do not correlate in a temporal fashion with (Al-26/Al-27)(0), suggesting that Be-10 and Al-26 were produced by different mechanisms. An examination of possible sources for the short-lived radionuclides indicates that production of Be-10 was almost certainly by particle irradiation, possibly within the solar system, and was probably accompanied by significant production of Ca-41 and Mn-53. In contrast, all of the Fe-60, most of the Al-26, and some of the Mn-53 were probably produced in stars and were imported into the solar system within presolar dust grains. Copyright (C) 2003 Elsevier Ltd. [References: 55]