ASTM-D2460 2007(Redline)

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D2460-07 Standard Test Method for Alpha-Particle-Emitting Isotopes of Radium in Water (Redline)

Published By	Publication Date	Number of Pages
ASTM	2007	9

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Description

Significance and Use

Radium is one of the most radiotoxic elements. Its isotope of mass 226 is the most hazardous because of its long half-life. The isotopes 223 and 224, although not as hazardous, are of some concern in appraising the quality of water.

The alpha-particle-emitting isotopes of radium other than that of mass 226 may be determined by difference if radium-226 is measured separately, such as by Test Method D 3454. Note that one finds ²²⁶ Ra and ²²³ Ra together in variable proportions ( 5, 6 ), but ²²⁴ Ra does not normally occur with them. Thus, ²²³ Ra often may be determined by simply subtracting the ²²⁶ Ra content from the total: and if ²²⁶ Ra and ²²³ Ra are low, ²²⁴ Ra may be determined directly. The determination of a single isotope in a mixture is less precise than if it occurred alone.

1. Scope

1.1 This test method covers the separation of dissolved radium from water for the purpose of measuring its radioactivity. Although all radium isotopes are separated, the test method is limited to alpha-particle-emitting isotopes by choice of radiation detector. The most important of these radioisotopes are ²²³ Ra, ²²⁴ Ra, and ²²⁶ Ra. The lower limit of concentration to which this test method is applicable is 3.7 x 10 ^-2 Bq/L (1 pCi/L).

1.2 This test method may be used for absolute measurements by calibrating with a suitable alpha-emitting radioisotope such as ²²⁶ Ra, or for relative methods by comparing measurements with each other. Mixtures of radium isotopes may be reported as equivalent ²²⁶ Ra. Information is also provided from which the relative contributions of radium isotopes may be calculated.

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 a specific precautionary statement, see 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

C859 Terminology Relating to Nuclear Materials D1129 Terminology Relating to Water D1193 Specification

Additional information

Standard Title	D2460-07 Standard Test Method for Alpha-Particle-Emitting Isotopes of Radium in Water (Redline)
Published Code	ASTM
Publication Date	2007
Pages Count	9

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ASTM-D2460 2007(Redline)

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