ASTM-D4785 2008(Redline)

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D4785-08 Standard Test Method for Low-Level Analysis of Iodine Radioisotopes in Water (Redline)

Published By	Publication Date	Number of Pages
ASTM	2008	12

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Category: ASTM

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Description

Significance and Use

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. Scope

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 .

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1129 Terminology Relating to Water D1193 Specification for Reagent Water D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water D3370 Practices for Sampling Water from Closed Conduits D3648 Practices for the Measurement of Radioactivity D3649 Practice for High-Resolution Gamma-Ray Spectrometry of Water D3856 Guide for Management Systems in Laboratories Engaged in Analysis of Water D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis

Keywords

iodine; ion exchange; low-level activity; radioiodine; radioactivity; solvent extraction w

Additional information

Standard Title	D4785-08 Standard Test Method for Low-Level Analysis of Iodine Radioisotopes in Water (Redline)
Published Code	ASTM
Publication Date	2008
Pages Count	12

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ASTM-D4785 2008(Redline)

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