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水中碘放射性同位素低水平分析的标准试验方法  
 【英文标准名称】  Standard Test Method for Low-Level Analysis of Iodine Radioisotopes in Water
 【原文标准名称】  水中碘放射性同位素低水平分析的标准试验方法
 【标准号】  ASTM D4785-2008
 【标准状态】  Active
 【国别】  美国
 【发布日期】  2008
 【实施或试行日期】  
 【发布单位】  美国材料与试验协会(US-ASTM)
 【起草单位】  D19.04
 【标准类型】  (Test Method)
 【标准水平】  ()
 【中文主题词】  
 【英文主题词】  iodine; ion exchange; low-level activity; radioiodine; radioactivity; solvent extraction water
 【摘要】  

This test method was developed for measuring low levels of iodine-131 in water. The results of the test may be used to determine if the concentration of iodine-131 in the sample exceeds the regulatory statutes for drinking water. With a suitable counting technique, sample size, and counting time, a detection limit of less than 0.037 Bq/L (1 pCi/L) is attainable by gamma-ray spectroscopy.

1.1 This test method covers the quantification of low levels of radioactive iodine in water by means of chemical separation and counting with a high-resolution gamma ray detector. Iodine is chemically separated from a 4-L water sample using ion exchange and solvent extraction and is then precipitated as cuprous iodide for counting.

1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information purposes only.

This standard does not purport to address all of the safety concerns, 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. For specific hazard statements, see Note 2 , Note 3, Note 9, and Section 9 .

 【中国标准分类号】  Z16
 【国际标准分类号】  13_060_50
 【页数】  9P.;A4
 【正文语种】  英语
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