ASTM E265-2007e1
用硫-32的放射性测量快速中子流量密度和反应速率的测试方法
Standard Test Method for Measuring Reaction Rates and Fast-Neutron Fluences by Radioactivation of Sulfur-32
ASTM E265-2007e1 中，可能用到以下仪器
- 标准号
- ASTM E265-2007e1
- 发布日期
- 2007年
- 实施日期
- 废止日期
- 无
- 中国标准分类号
- F46
- 国际标准分类号
- 27.120.30 (Fissile materials and nuclear fuel tech
- 发布单位
- US-ASTM
- 适用范围
Refer to Guides E 720
and E 844 for the selection, irradiation, and quality control of neutron dosimeters. Refer to Practice E 261
for a general discussion of the determination of fast-neutron fluence and fluence rate with threshold detectors. The activation reaction produces 32P, which decays by the emission of a single beta particle in 100 % of the decays, and which emits no gamma rays. The half life of 32P is 14.262 (14) days (1) and the maximum beta energy is 1710 keV(2).
Elemental sulfur is readily available in pure form and any trace contaminants present do not produce significant amounts of radioactivity. Natural sulfur, however, is composed of 32S (95.02 % (9)), 34S (4.21 % (8)) (1), and trace amounts of other sulfur isotopes. The presence of these other isotopes leads to several competing reactions that can interfere with the counting of the 1710-keV beta particle. This interference can usually be eliminated by the use of appropriate techniques, as discussed in Section 8.
1.1 This test method describes procedures for measuring reaction rates and fast-neutron fluences by the activation reaction 32S(n,p)32P.
1.2 This activation reaction is useful for measuring neutrons with energies above approximately 3 MeV.
1.3 With suitable techniques, fission-neutron fluences from about 5 x00D7; 108 to 1016 n/cm2 can be measured.
1.4 Detailed procedures for other fast-neutron detectors are described in Practice E 261
. 1.5 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.