Radiation detectors should detect gamma and x-ray radiation, at minimum, with a response time that is no more than 20 seconds.
For detailed calibration requirements of specific survey radiation detector meters, facilities should contact appropriate regulatory agencies.
If battery voltage falls below the level to perform adequately, a low-battery alarm - visible or audible - should alert the user. Radiation monitors should also have easily rechargeable batteries.
There are new radiation detector designs with large-volume ionization chambers for exposure and dose equivalent measurement.
There is a potential for error in exposure measurements whenever the volume of the ionization chamber increases. This is due to recombination losses and polarity effects.
An accredited or national radiation detector laboratory should calibrate for proper polarity and minimal recombination loss before any ionization chamber is used for exposure measurements. Failing to do so could lead to a significant error in radiation monitor exposure measurements.

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