实践八号育种卫星搭载植物种子的空间辐射剂量分析

为了探明植物种子在空间搭载后发生一系列改变的原因,尤其是探寻空间辐射与突变发生的内在关联,设计了"照相定位"实验法,采用CR-39固体核径迹探测器来探测空间重离子,并利用空间重离子径迹与植物种子的相对位置,来确定被重离子击中的种子及其击中部位;同时用LiF热释光片测量种子所受的较低LET空间辐射的剂量。结果表明,"照相定位"法简便易行,经济实用,并极大地缩短镜下分析时间;最终测得空间重离子注量率为4.44个/cm2.d,种子所受较低LET空间辐射的平均剂量为4.79mGy。

SPACE RADIATION MEASUREMENT OF PLANT SEEDS BOARDING ON THE SHIJIAN-8 SATELLITE

In order to identify cause of mutagenesis of plant seeds induced by space flight, especially to ascertain the interrelation between space radiation and mutagenesis,a "photograph location" experimental setup was designed in this study.CR-39 solid-state nuclear track detectors were used to detect space heavy particles.The plant seeds and their position hit by space heavy ions were checked based on relative position between track and seeds in the setup.The low LET part of the spectrum was also measured by thermoluminescence dosemeter(TLD,LiF).The results showed that the "photograph location" experimental method was convenient,practicable and economical.This new method also greatly saved time for microscopical analysis.On Shijian-8 satellite,the average ion flux of space heavy ions was 4.44 ions/cm~2·d and the average dosage of low LET space radiation to the plant seeds was 4.79 mGy.