Gamma ray astronomy

The potential value of investigation of the γ-ray content of cosmic radiation has long been recognized, but evaluation of measurements made with high-flying balloons is difficult because of the generation of secondary γ-rays in the atmosphere above the detector. The availability of artificial satellites has eliminated this difficulty, and this article reviews current ideas in this field of cosmic ray research in the light of results obtained with satellites OSO III, SAS II, and Cos B.     

Gamma ray astronomy and the COS-B satellite

Gamma photon by gamma photon, throughout almost seven years of perfect operation the European satellite COS-B has produced what amounts to a high-energy chart of the sky: this gives a totally new view of the Milky Way, our Galaxy. COS-B discovered new stars, extraordinarily intense sources of gamma radiation, most of which are invisible at other wavelengths. Are they young pulsars, the remains of supernovae, or evidence of black holes?     

γ辐射用于草莓保鲜

中国南方,草莓采收季节,草莓当天就要霉烂变质。本文研究了γ辐射对延缓草莓霉变腐烂速度的有效作用,指出了该方法不能改变储藏温度对于草莓保鲜的重要作用,比较了3种不同辐照剂量的不同效果,揭示了在冰箱冷藏条件下,2kGy和3kGy剂量的γ辐照,能使草莓储存保鲜期提高到12d以上。     

X射线荧光光谱仪在珍珠检测中的应用

为了给鉴定海水珍珠和淡水珍珠提供依据,应用X射线荧光光谱仪对一些海水珍珠和淡水珍珠进行分析比对,结果表明在X射线荧光光谱分析图谱中海水珍珠的Sr峰位比淡水珍珠中的Sr峰位高。