Interlaboratory comparisons of low-level tritium measurements in water. Organized by IAEA

The increase of the number of laboratories engaged in the routine measurements of tritium in water is noted. The increase was from 12 laboratories in 1963 to 41 in 1976. It is estimated that about 95% of existing active laboratories in assaying the environmental tritium level take part in the intercomparison. The number of laboratories goes to saturation. Nevertheless, a few new laboratories set up in developing countries should be added to complete the picture for 1979. Increase of the lowest detectable tritium concentration and the analytical accuracy is also easily seen, however, difficult to be presented in numbers. In 1963 the lowest error of analysis was quoted as +-2 T.U. In 1969 it was already 0.4 and in 1976 0.03 T.U