Technical Associates VAP-X-(H3) Tritium Monitor is a sensitive, rugged, portable instrument for detection and measurement of Tritium vapor in the soil. Its subtractive balanced chamber electrometer circuit decreases background effects to negligible levels and its deionized and filtered intake reduces to negligible levels spurious effects from dust and existing ionization in soil air. It is battery or AC operated.

Inlet and outlet hoses are provided. The PTG-9 will measure airborne Tritium in any form: water vapor, hydrogen gas, or volatile chemicals in concentrations as low as 1 x 10-5 uCi/cc of air. (370 KBq/m3)

All instruments are calibrated at the factory. Calibration check may be performed in the field with a microCurie level Beta or Gamma source. The background chamber may be disconnected to check linearity of response on a gamma calibration range. User-friendly calibration controls are provided.