ASTM-D2460 › Historical Revision Information
Standard Test Method for Alpha-Particle-Emitting Isotopes of Radium in Water
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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 223Ra, 224Ra, and 226Ra. 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 226Ra, or for relative methods by comparing measurements with each other. Mixtures of radium isotopes may be reported as equivalent 226Ra. 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.
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
Keywords
alpha particles; radioactivity; radium isotopes; water; ICS Number Code 13.060.50 (Examination of water for chemical substances); 13.060.60 (Examination of water for physical properties)
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13.060.50 (Examination of water for chemical substances)
13.060.60 (Examination of physical properties of water)
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Document Number
ASTM-D2460-07
Revision Level
2007 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
June 15, 2007
Document Type
Test Method
Page Count
7 pages
Committee Number
D19.04