为宇宙射线中稀有事件搜索作准备的各种高空位置辐射本底研究
Study of radiation background at various high altitude locations in preparation for rare event search in cosmic rays
摘要：
多年来提出的各种唯象模型暗示了奇异夸克物质（SQM）在宇宙射线中可能存在。寻找这种罕见事件的一种方法是在高山海拔部署大面积核径迹探测器阵列。在开始部署任何此类阵列之前，必须对辐射背景进行详细研究。此外，有必要适当了解探测器在极端天气条件下的响应。为此目的，在印度的大吉岭（海拔2 200米）、乌蒂（海拔2 200米）和汉勒（海拔4 500米）等高海拔地区进行了试点研究。CR-39和高阈值聚对苯二甲酸乙二醇酯（PET）探测器的小阵列被暴露在户外，暴露时间从三个月到两年不等。本文报告了这些研究的结果。
英文摘要：
Various phenomenological models presented over the years have hinted at the possible presence of strangelets, which are nuggets of Strange Quark Matter (SQM), in cosmic rays. One way to search for such rare events is through the deployment of large area Nuclear Track Detector (NTD) arrays at high mountain altitudes. Before the deployment of any such array can begin, a detailed study of the radiation background is essential. Also a proper understanding of the response of detectors exposed to extreme weather conditions is necessary. With that aim, pilot studies were carried out at various high altitude locations in India such as Darjeeling (2200 m a.m.s.l), Ooty (2200 m a.m.s.l) and Hanle (4500 m a.m.s.l). Small arrays of CR-39 as well as high threshold Polyethylene Terephthalate (PET) detectors were given open air exposures for periods ranging from three months to two years. The findings of such studies are reported in this paper.
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