Tritium Monitor

Tritium Air Monitor: High performance portable survey monitor

SENSITIVITY

The 400SBDγC is useful for measurements as low as 2 μCi/m3 . The new OTC electrometer, which measures to below 10-16 amperes combines low noise and high zero stability. Unlike other instruments, the 400 series instruments no longer require a front panel manual zero control. Thermally induced zero shifts of the electrometer and associated electronics have been eliminated.

Tritium Air Monitor: Model 400SBDγC

RADON INTERFERENCE, NOISE RESPONSE

For an unambiguous measurement of very low tritium a monitor must be able to ignore response to ambient radon. The 400SB series incorporates this capability and therefore produces accurate, fast and drift free measurements to nearly +1 μCi/m3 .

TOTAL GAMMA COMPENSATION

Cruciform ionization chamber geometry provides nearly perfect gamma compensation regardless of photon energy, flux gradient or flux direction. Gamma compensation of the 400 series instruments is typically three orders of magnitude better than instruments using nested or side by side ionization chambers.

Tritium Air Monitor: Model 400SBDγC

FAST RESPONSE

Its exceptionally rapid response is uniquely due to its ability to ignore radon. The electronic time constant is only 10 seconds, the pneumatic time constant of about 12 seconds, for an overall time constant of only 15 seconds. Meter readings will reach 90 % of final value within 30 seconds to a step response of aspirated tritium.

FAST WARM UP, NO ZERO DRIFT

After applying power, the initial transient “warm up” drift effects take less than a minute. Long term drifts have been eliminated, manual zero adjustments are no longer required.

HTO DISCRIMINATION (MODEL 400SBDγC-HTO)

By addition of a desiccant column, this survey instrument will specifically measure HTO in the presence of other radioactive gases as well as background gamma. The desiccant can be regenerated repeatedly for reuse.

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