Nishiyama Jun, Harano Hideki, Matsumoto Tetsuro, Sato Yasushi, Uritani Akira, Kudo Katsuhisa
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Japan.
Radiat Prot Dosimetry. 2012 Jan;148(2):237-41. doi: 10.1093/rpd/ncr029. Epub 2011 Mar 15.
The thermal neutron fluence rate is determined by the gold activation method. The absolute activity of the irradiated gold foil is measured by a 4πβ-γ coincidence counter. Using this method, corrections for the detection of conversion electrons and gamma rays by a 4πβ counter are very important to obtain accurate absolute activity. In this work, Monte Carlo simulations were performed to derive the correction factor K. The absolute measurement of (198)Au activity for 20-100 μm thickness Au foils were performed to verify the calculating model of the 4πβ-γ coincidence counting system.
热中子注量率通过金活化法测定。辐照金箔的绝对活度由4πβ-γ符合计数器测量。使用这种方法时，4πβ计数器对转换电子和γ射线探测的校正对于获得准确的绝对活度非常重要。在这项工作中，进行了蒙特卡罗模拟以推导校正因子K。对厚度为20 - 100μm的金箔进行了(198)Au活度的绝对测量，以验证4πβ-γ符合计数系统的计算模型。
