ASTM D 7938 : 2021

1.1The intended use of this practice is for sampling of gasses containing ¹⁴C in inorganic, organic or particulate forms. This sampling practice captures the ¹⁴C in a media that can be submitted to a laboratory for analysis, typically by liquid scintillation counting (LSC)

1.2This practice does not include the needed steps for the liberation of ¹⁴C from the media on which it was adsorbed or those for the preparation for LSC sample preparation in the laboratory prior to liquid scintillation analysis. This practice does not include the methodology used to analyze the prepared samples by LSC.

1.3The overall ¹⁴C analytical detection capability is impacted by a number of factors including the volume sampled, the method used to desorb the ¹⁴C from the media, and the analytical method used the measure ¹⁴C from the media. This practice only directly addresses the volume of the gas stream from which any present ¹⁴C would be adsorbed.

1.4The values stated in pCi units are to be regarded as standard given the reporting requirements of the U.S. NRC Regulatory Guide 1.21. The Bq values given in parenthesis are mathematical conversions to SI units that are provided for information only and are not considered standard. Other values stated in SI units are to be regarded as standard.

1.5This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.