1.1本试验方法描述了通过活化反应测量反应速率和快中子注量的程序 32 S（n，p） 32 P 1.2该活化反应有助于测量能量高于约3 MeV的中子。 1.3采用适当的技术，裂变中子注量约为5 × 10 8. 至10 16 牛顿/厘米 2. 可以测量。 1.4实践中描述了其他快中子探测器的详细程序 E261 . 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1参考指南 E720 和 E844 用于中子剂量计的选择、辐照和质量控制。 5.2参考实践 E261 关于用阈值探测器测定快中子注量和注量率的一般性讨论。 5.3活化反应产生 32 P、 在100分钟内，它会随着单个β粒子的发射而衰减 % 没有发出伽马射线。的半衰期 32 P为14.262（14） 3. 天 ( 1. ) 4. 最大β能量为1710千电子伏 ( 2. ) . 5.4元素硫以纯净的形式容易获得，存在的任何微量污染物不会产生大量放射性。 然而，天然硫是由 32 S（95.02 % (9)), 34 S（4.21 % (8)) ( 1. )和微量其他硫同位素。这些其他同位素的存在会导致几个相互竞争的反应，这些反应可能会干扰1710 keVβ粒子的计数。如第8节所述，通常可以通过使用适当的技术来消除这种干扰。

1.1 This test method describes procedures for measuring reaction rates and fast-neutron fluences by the activation reaction 32 S(n,p) 32 P. 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 × 10 8 to 10 16 n/cm 2 can be measured. 1.4 Detailed procedures for other fast-neutron detectors are described in Practice E261 . 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. ====== Significance And Use ====== 5.1 Refer to Guides E720 and E844 for the selection, irradiation, and quality control of neutron dosimeters. 5.2 Refer to Practice E261 for a general discussion of the determination of fast-neutron fluence and fluence rate with threshold detectors. 5.3 The activation reaction produces 32 P, 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 32 P is 14.262 (14) 3 days ( 1 ) 4 and the maximum beta energy is 1710 keV ( 2 ) . 5.4 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 32 S (95.02 % (9)), 34 S (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.