Matsumoto T, Harano H, Shimoyama T, Kudo K, Uritani A
National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan.
Radiat Prot Dosimetry. 2007;126(1-4):155-8. doi: 10.1093/rpd/ncm033. Epub 2007 May 19.
We are developing a national standard of a monoenergetic kilo electron volt neutron field with the (45)Sc(p,n)(45)Ti resonance reaction. A wide resonance yields 27.4 keV neutrons at 0 degrees with respect to the proton beam. The proton energy was precisely determined in the measurement of the relative neutron yield as a function of the proton energy from the threshold energy to 2.942 MeV. Absolute measurement of the monoenergetic neutron fluence was performed using a (3)He proportional counter. Relative measurement was also carried out using a Bonner sphere calibrated at our 144 keV standard neutron field. Calibration factors were obtained between the count of a neutron monitor and the neutron fluence. A silicon-surface barrier detector with a (6)LiF foil converter was also being developed for the neutron fluence measurement. Successful results were obtained in the tests in the 144 keV standard neutron field.
我们正在利用(45)Sc(p,n)(45)Ti共振反应开发单能千电子伏特中子场的国家标准。宽共振在相对于质子束0度的情况下产生27.4 keV中子。在测量从阈能到2.942 MeV的质子能量作为相对中子产额的函数时，精确测定了质子能量。使用(3)He正比计数器进行了单能中子注量的绝对测量。还使用在我们的144 keV标准中子场校准的邦纳球进行了相对测量。获得了中子监测器计数与中子注量之间的校准因子。还在开发一种带有(6)LiF箔转换器的硅面垒探测器用于中子注量测量。在144 keV标准中子场的测试中取得了成功结果。
