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ISO 20041-2:2025

Tritium and carbon-14 activity in gaseous effluents and gas discharges of nuclear installations - Part 2: Determination of tritium and carbon-14 activities sampled by bubbling technique
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ISO 20041-2:2025

Tritium and carbon-14 activity in gaseous effluents and gas discharges of nuclear installations - Part 2: Determination of tritium and carbon-14 activities sampled by bubbling technique

PUBLISH DATE 2025
ISO 20041-2:2025

The objective of this document is to characterize the gaseous effluents tritium and carbon-14 generated by nuclear facilities during operation and decommissioning and occurring in the same chemical species as hydrogen and carbon, e. g. as water vapour (HTO), hydrogen gas (HT, TT), carbon dioxide (14CO2), carbon monoxide (14CO), methane (CH3T, 14CH4). It concerns measurements on samples that are representative of a certain volume stream or volume of discharge during a given period of time and of the corresponding volume discharged. The result is therefore expressed in becquerels.

This document applies to samples that were obtained by sampling methods according to ISO 20041-19 and describes

  • analysis methods for the determination of tritium and carbon-14 activities by liquid scintillation counting, and
  • calculation methods to determine the tritium activities discharged as tritiated water vapour (HTO) and tritium in other chemical compounds (non-HTO) as well as carbon-14 activities discharged as carbon dioxide (14CO2) and carbon-14 in other chemical compounds (non-14CO2).

This document does not apply to tritium and carbon-14 activity concentrations in the environmental air, e.g. in the vicinity of nuclear installations.

The accountability rules of the activities discharged necessary for the establishment of regulatory reports do not fall within the scope of this document and are the responsibility of the regulatory bodies.

SDO ISO: International Organization for Standardization
Document Number ISO 20041
Publication Date Jan. 1, 2025
Language en - English
Page Count 48
Revision Level
Supercedes
Committee ISO/TC 85/SC 2
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