ASTM D4785-08(2013)e1
Standard Test Method for Low-Level Analysis of Iodine Radioisotopes in Water

Standard No.

ASTM D4785-08(2013)e1

Release Date

2008

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D4785-20

Latest

ASTM D4785-20

Scope

5.1 This test method was developed for measuring low levels of radioactive iodine in water. The results of the test may be used to determine if the concentration of several radioisotopes of iodine 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. This method was tested for8201;¹³¹I . Other iodine radioisotopes should behave in an identical manner in this procedure. However, other iodine radioisotopes have not been tested according to Practice D2777. The user of this method is responsible for determining applicability, bias, and precision for the measurement of other iodine radioisotopes using this method.

5.2 This procedure addresses the analysis of iodine radioisotopes with half-lives greater than 2 hours, which include 8201;¹²¹I, 8201;¹²³I, 8201;¹²⁴I, 8201;¹²⁵I, 8201;¹²⁶I, 8201;¹²⁹I, 8201;¹³⁰I, 8201;¹³¹I, 8201;¹³²I, 8201; ¹³³I, and 8201;¹³⁵I.

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.

1.3 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 8.17, 8.18, 8.19, Section 9, and 13.2.11.

ASTM D4785-08(2013)e1 Referenced Document

• ASTM D1129 Standard Terminology Relating to Water
• ASTM D1193 Standard Specification for Reagent Water
• ASTM D2777 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
• ASTM D3370 Standard Practices for Sampling Water from Closed Conduits
• ASTM D3648 Standard Practices for the Measurement of Radioactivity
• ASTM D3649 Standard Test Method for High-Resolution Gamma-Ray Spectrometry of Water
• ASTM D3856 Standard Guide for Good Laboratory Practices in Laboratories Engaged in Sampling and Analysis of Water
• ASTM D5847 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis

ASTM D4785-08(2013)e1 history

• 2020 ASTM D4785-20 Standard Test Method for Low-Level Analysis of Iodine Radioisotopes in Water
• 2008 ASTM D4785-08(2013)e1 Standard Test Method for Low-Level Analysis of Iodine Radioisotopes in Water
• 2008 ASTM D4785-08 Standard Test Method for Low-Level Analysis of Iodine Radioisotopes in Water
• 2000 ASTM D4785-00a Standard Test Method for Low-Level Iodine-131 in Water
• 1993 ASTM D4785-93 Standard Test Method for Low-Level Iodine-131 in Water