ASTM C1514-08R17 - Standard Test Method for Measurement of ²³⁵U Fraction Using Enrichment Meter Principle

1.1 This test method covers the quantitative determination of the fraction of ²³⁵U in uranium using measurement of the 185.7 keV gamma-ray produced during the decay of ²³⁵U.

1.2 This test method is applicable to items containing homogeneous uranium-bearing materials of known chemical composition in which the compound is considered infinitely thick with respect to 185.7 keV gamma-rays.

1.3 This test method can be used for the entire range of ²³⁵U fraction as a weight percent, from depleted (0.2 % ²³⁵U) to highly enriched (97.5 % ²³⁵U).

1.4 Measurement of items that have not reached secular equilibrium between ²³⁸U and ²³⁴Th may not produce the stated bias when low-resolution detectors are used with the computational method listed in Annex A2.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 This standard may involve hazardous materials, operations, and equipment. 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.