|
|||||
|
|
Effect of vacuum, oxygen and carbon dioxide on the track registration in SR-90 and CR-39 |
|
| Authors: | M Fujii R Yokota T Kobayashi H Hasegawa |
| Institution: | * Aomori University, Faculty of Engineering, 2-3-1 Kobata, Aomori, 030, Japan † Institute of Space and Astronautical Science, Yoshinodai, Sagamihara, 229, Japan ‡ Aoyama gakuin University, 6-16-1 Chitosedai, Setagaya, Tokyo, 157, Japan § Fukuvi Chemical Industry Co., Ltd. Sakaicho, Sakaigun, Fukui, 919-05, Japan |
| Abstract: | The molecular structure of SR-90 and CR-39 is very similar except that the average length of carbonate linkages in SR-90 is 1.6 times longer than in CR-39. However, the effect of vacuum and carbon dioxide (CO2) on the track registration of these two detectors is very different: 1) the sensitivity of CR-39 becomes very low in vacuum; the sensitivity of SR-90 does not go down to zero even after storage in vacuum for a long time; 2) the sensitivity of SR-90 decreases both in air and in vacuum but the original sensitivity can be restored by storing it in CO2 of 1 3 atm for several days. We also found that the sensitization of latent tracks by oxygen (O2) is effective only at the time of irradiation but the sensitization by CO2 is effective after irradiation. |
| Keywords: | SR-90 CR-39 polymer track detector sensitivity ageing vacuum oxygen carbon dioxide |
| 本文献已被 ScienceDirect 等数据库收录！ | |