کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1885490 | 1043424 | 2008 | 4 صفحه PDF | دانلود رایگان |
Observation of trans-iron nuclei in galactic cosmic rays (Z⩾30Z⩾30) requires a high performance cosmic ray detector telescope with a large exposure area because of their extremely low fluxes. A solid-state track detector such as CR-39 has the advantage of easy extension of exposure area, but it is necessary to raise the Z/βZ/β detection threshold in order to suppress background tracks produced by galactic cosmic rays with Z/β<30Z/β<30. The track registration sensitivity and detection threshold for heavy ions with various Z*/βZ*/β were verified by using track detectors of copolymers of CR-39 and DAP (diallyl phthalate) with various DAP concentration. We found that it is possible to control the Z*/βZ*/β detection threshold of copolymers by changing DAP concentration. In order to detect heavy ions with Z*/β⩾30Z*/β⩾30, the optimum DAP concentration was found to be approximately 50%.
Journal: Radiation Measurements - Volume 43, Supplement 1, August 2008, Pages S52–S55