摘要
本工作涉及准确测量国产Am-Be中子源发射的4.438 MeV γ射线与中子强度比值R=Sγ/Sn的实验方法。中子源的中子发射率用锰浴法进行比对测量。用75 mm×75 mm NaI(Tl)探测器测量中子源的γ能谱;用MCNP程序模拟计算中子引起的γ本底和探头的源峰探测效率。实验与理论计算得到的R值符合得很好。综合评价已发表的R实验值,给出了R推荐值为0.575(1±4.8%)。结果表明,R值可认为是Am-Be源的一标志性特征量。
The present research concerns in the accurate measurement of the 4. 438 MeV γ-ray to total neutron intensity ratio, namely R=Sr/Sn, for homemade Am-Be neutron source. The neutron strength of the source relative to a previously standardized source was determined by the manganese bath technique. The y-ray spectra of the source were measured using a φ75mm×75 mm NaI（T1） detector. The background induced by neu- trons and the absolute full energy peak efficiency of the detector were calculated using the MCNP code. The experimental ratio obtained agrees well with the calculated value. A synthetic evaluated and recommended value of R=0.575（1±4.8%） was given. The experimental R value appears an important characteristic for the Am-Be source.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2008年第4期300-304,共5页
Atomic Energy Science and Technology
