Improved method of measurement for tritiated water standardization by internal gas proportional counting

Tritiated water has been standardized by internal gas counting following its chemical reduction to tritiated hydrogen by using a new tritium generator and an improved method of measurement. This method is based on the equality between the molar activities of the tritiated water and the tritiated hydrogen and is valid only when the reduction yield is unitary. It is simpler and more accurate than the conventional method. Two samples of tritiated water from a sealed ampoule were measured by internal gas proportional counting using both the conventional method and the improved method of measurement. The obtained results demonstrated the validity of the improved method.