Doke T, Hayashi T, Kikuchi J, Nagaoka S, Nakano T, Sakaguchi T, Terasawa K, Badhwar G D
Advanced Research Institute for Science and Engineering, Waseda University, Okubo 4-3-1, Shinjuku-ku, Tokyo, Japan.
Mutat Res. 1999 Dec 6;430(2):191-202. doi: 10.1016/s0027-5107(99)00130-x.
A new type of real-time radiation monitoring device, RRMD-III, consisting of three double-sided silicon strip detectors (DSSDs), has been developed and tested on-board the Space Shuttle mission STS-84. The test succeeded in measuring the linear energy transfer (LET) distribution over the range of 0.2 keV/micrometer to 600 keV/micrometer for 178 h. The Shuttle cruised at an altitude of 300 to 400 km and an inclination angle of 51.6 degrees for 221.3 h, which is equivalent to the International Space Station orbit. The LET distribution obtained for particles was investigated by separating it into galactic cosmic ray (GCR) particles and trapped particles in the South Atlantic Anomaly (SAA) region. The result shows that the contribution in dose-equivalent due to GCR particles is almost equal to that from trapped particles. The total absorbed dose rate during the mission was 0.611 mGy/day; the effective quality factor, 1.64; and the dose equivalent rate, 0.998 mSv/day. The average absorbed dose rates are 0.158 mGy/min for GCR particles and 3.67 mGy/min for trapped particles. The effective quality factors are 2.48 for GCR particles and 1.19 for trapped particles. The absorbed doses obtained by the RRMD-III and a conventional method using TLD (Mg(2)SiO(4)), which was placed around the RRMD-III were compared. It was found that the TLDs showed a lower efficiency, just 58% of absorbed dose registered by the RRMD-III.
一种新型的实时辐射监测设备RRMD - III已被开发出来，它由三个双面硅条探测器（DSSD）组成，并在航天飞机任务STS - 84中进行了测试。该测试成功地在178小时内测量了0.2 keV/微米至600 keV/微米范围内的线能量转移（LET）分布。航天飞机在300至400公里的高度和51.6度的倾角下巡航了221.3小时，这与国际空间站的轨道相当。通过将其分为银河系宇宙射线（GCR）粒子和南大西洋异常区（SAA）中的捕获粒子，对获得的粒子LET分布进行了研究。结果表明，GCR粒子对剂量当量的贡献几乎与捕获粒子的贡献相等。任务期间的总吸收剂量率为0.611 mGy/天；有效品质因数为1.64；剂量当量率为0.998 mSv/天。GCR粒子的平均吸收剂量率为0.158 mGy/分钟，捕获粒子的平均吸收剂量率为3.67 mGy/分钟。GCR粒子的有效品质因数为2.48，捕获粒子的有效品质因数为1.19。比较了RRMD - III和一种使用置于RRMD - III周围的热释光剂量计（TLD，Mg(2)SiO(4)）的传统方法所获得的吸收剂量。结果发现，TLD的效率较低，仅为RRMD - III记录的吸收剂量的58%。
