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)^[3]. 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.

Cross References:
ISO/IEC 17025
ISO/IEC Guide 99
ISO 5667-3
ISO 5667-1
ISO 11929
ISO 80000-10
ISO 5667-10
ISO/IEC Guide 98-3
ISO 19361
ISO 10703
ISO 3696
ISO 20042
ISO 5667-6
ISO 5667-11
ISO 5667-4
ISO 11885
ISO 5667-20
ISO 13164-3
ISO 5667-5
ISO 13164-2
IAEA GSG-2
ISO 5667-14
ISO 15586
ISO 5667-7
ISO 5667-9
ISO 5667-8


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