Abstract
Observation of trans-iron nuclei in galactic cosmic rays (Z ≥ 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 / β detection threshold in order to suppress background tracks produced by galactic cosmic rays with Z / β < 30. The track registration sensitivity and detection threshold for heavy ions with various Z 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 / β detection threshold of copolymers by changing DAP concentration. In order to detect heavy ions with Z / β ≥ 30, the optimum DAP concentration was found to be approximately 50%.
Original language | English |
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Journal | Radiation Measurements |
Volume | 43 |
Issue number | SUPPL.1 |
DOIs | |
Publication status | Published - 2008 Aug |
Keywords
- Copolymer
- CR-39
- DAP
- Galactic cosmic rays
- Solid-state track detector
- Threshold
- Track registration sensitivity
- Trans-iron nuclei
- Ultra heavy nuclei
ASJC Scopus subject areas
- Radiation