NF ISO 20045, M60-311 (07/2023)

This document describes a test method for determining the activity concentration of atmospheric tritium by trapping tritium in air by bubbling through an aqueous solution. Atmospheric tritium activity concentration levels are expressed in becquerels per cubic meter (Bq·m-3). The formulas given are valid for a sampling system with four bubblers. They are also applicable to trapping systems with a single trapping module consisting of two bubblers, provided that the atmosphere in which the sampling takes place contains only tritiated water vapor (HTO). This document does not cover results for laboratory test samples, in becquerels per liter of trapping solution, in accordance with ISO 9698 or ISO 13168. The result of the detection limit of the test method is between 0.2 Bq·m-3 and 0.5 Bq·m-3 for a sampling period of approximately one week.
(Automatic translation from French)