Mondal P K, Chatterjee B K
Department of Physics, Bose Institute, 93/1A P C Road, Kolkata 700009, India.
Appl Radiat Isot. 2013 Jul;77:61-7. doi: 10.1016/j.apradiso.2013.02.021. Epub 2013 Mar 6.
The superheated droplet detector (SDD) is known to be gamma ray insensitive below a threshold temperature which made them excellent candidates for neutron detection in the presence of gamma rays. Above the threshold temperature, the gamma ray detection efficiency increases with increase in temperature. In this work the gamma ray threshold temperature has been studied for SDD using R404A as the active liquid and is compared to the theoretical prediction. The temperature variation of gamma ray detection efficiency and interstate transition kinetics has also been studied using a two-state model. The experiments are performed at the ambient pressure of 1 atm and in the temperature range of 17-32 °C using a 662 keV (1)(37)Cs gamma ray source.
众所周知，过热液滴探测器（SDD）在低于阈值温度时对伽马射线不敏感，这使其成为在存在伽马射线的情况下进行中子探测的理想候选者。高于阈值温度时，伽马射线探测效率随温度升高而增加。在这项工作中，以R404A作为活性液体，研究了SDD的伽马射线阈值温度，并与理论预测进行了比较。还使用双态模型研究了伽马射线探测效率的温度变化和态间跃迁动力学。实验在1个大气压的环境压力下进行，使用662 keV的（1）（37）Cs伽马射线源，温度范围为17 - 32°C。
