ASTM E481-16
用钴和银的放射性测定中子积分通量率的试验方法

Standard Test Method for Measuring Neutron Fluence Rates by Radioactivation of Cobalt and Silver

标准号

ASTM E481-16

发布

2016年

发布单位

美国材料与试验协会

当前最新

ASTM E481-16

 

 

引用标准

ASTM E170 ASTM E177 ASTM E181 ASTM E261 ASTM E262

适用范围

3.1 This test method uses one monitor (cobalt) with a nearly 1/v absorption cross-section curve and a second monitor (silver) with a large resonance peak so that its resonance integral is large compared to the thermal cross section. The pertinent data for these two reactions are given in Table 1. The equations are based on the Westcott formalism ((2, 3) and Practice E261) and determine a Westcott 2200 m/s neutron fluence rate nv₀ and the Westcott epithermal index parameter . References (4, 5, and 6) contain a general discussion of the two-reaction test method. In this test method, the absolute activities of both cobalt and silver monitors are determined. This differs from the test method in the references wherein only one absolute activity is determined.

(A) The numbers in parenthesis following given values are the uncertainty in the last digit(s) of the value; 0.729 (8) means 0.729 ± 0.008, 70.8(1) means 70.8 ± 0.1.

(B) A 2200 m/s cross section (E = 0.0253 eV, T = 20°C) was taken from the sources indicated in Ref (9).

(C) Cross section uncertainty data is taken from Ref (7) , the cross section comes from the other reference.

(D) Calculated using Eq 10.

(E) Cross section uncertainty comes from covariance data provided in the cross section source. The other reference indicates the source of the cross section.

(F) In Fig. 1, Θ = 4E_rkT/AΓ ² = 0.2 corresponds to the value for ¹⁰⁹Ag for T = 293 K, ∑_r = N₀σ_{r, max}. σ_{r, max}=29999 barn at 5.19 eV (行业解决方案 | 石油化工行业看过来~全方位颜色测量方案！

2）黄度指数表征物体色黄的程序，用YI表示，用于评价塑料质量和老化程度。正值表示材料呈现黄色，负值表示材料呈现蓝色。黄度主要有ASTM E313黄度和D1925黄度。3）透光率表示光线透过介质的能力，为透过试样的光通量与照射到试样上的光通量之比，为百分数，用T表示。4）雾度是透明或半透明材料的内部或表面由于光漫射造成的云雾状或混浊的外观，是其光学透明性的重要参数。...

---

谁引用了ASTM E481-16 更多引用

ASTM E1005-21 反应堆容器监测用辐射监测器的应用和分析的标准试验方法 ASTM E261-16(2021) 用放射性技术测定中子注量、注量率和光谱的标准实施规程 ASTM E944-19 反应堆监视中中子能谱调整方法应用的标准指南 ASTM E1854-19 确保电子零件中子诱发位移损伤试验一致性的标准实施规程 ASTM E262-17 通过放射活化技术测定热中子反应速率和热中子流动速率的标准测试方法 ASTM E1005-16 反应堆压力容器监测E706(ⅢA)用辐射监视器的应用和分析的试验方法　　 ASTM E261-16 测量和计算建筑物楼面面积的建筑物损失特征的标准实施规程 ASTM E944-13e1 反应堆监视中中子能谱调整方法应用的标准指南 ASTM E262-13 用放射性技术测量热中子反应速率和注量率的标准试验方法 ASTM E1854-13 确保电子部件的中子引起的位移损伤试验一致性的标准实施规程

---