Tritium in water testing with the Hidex 300 and 600 SL liquid scintillation counters

18 August 2021

Hidex TDCR technology is ideal for water testing 

The Hidex 300 SL and 600 SL liquid scintillation counters have a unique triple photomultiplier tubes (PMT) detector system that helps assess a false-positive from tritium when water testing.

The triple-to-double coincidence ratio (TDCR) generates two sets of data; a blue spectrum based on two PMTs in coincidence (like a traditional LSC), and a red spectrum based on three PMTs in coincidence. 

Tritium will have mirroring blue and red spectra. The spectrum width and height depend on quench and the activity of the sample respectively

Luminescence (false-positive) cannot occur on three PMTs in coincidence, but can occur on two PMTs (like a traditional LSC).

Using TDCR it is possible to assess if tritium is really present in water samples or it is a false positive (high counts but no mirroring spectra).

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