This document specifies a method for the measurement of 99Tc in all types of waters by liquid
scintillation counting (LSC).
The method is applicable to test samples of supply/drinking water, rainwater, surface and ground water,
as well as cooling water, industrial water, domestic, and industrial wastewater after proper sampling
and handling, and test sample preparation. A filtration of the test sample is necessary.
The detection limit depends on the sample volume and the instrument used. The method described
in this document, using currently available LSC instruments, has a detection limit of approximately
5 Bq·kg^-1 to 20 Bq·kg^-1, which is lower than the WHO criteria for safe consumption of drinking water
(100 Bq l^-1). These values can be achieved with a counting time of 30 min for a sample volume varying
between 14 ml to 40 ml. The method presented in this document is not intended for the determination
of ultra-trace amount of 99Tc.
The activity concentration values in this document are expressed by sample mass unit instead of
sample volume unit as it is usually the case in similar standards. The reason is that 99Tc is measured in
various matrix types such as fresh water or sea water, which have significant differences in density. The
activity concentration values can be easily converted to sample volume unit by measuring the sample
volume. However, it increases the uncertainty on the activity concentration result.
The method described in this document is applicable in the event of an emergency situation, but not
if 99mTc is present at quantities that could cause interference and not if 99mTc is used as a recovery tracer.
The analysis of Tc adsorbed to suspended matter is not covered by this method.
It is the user’s responsibility to ensure the validity of this test method for the water samples tested.