Calibration of ionization chamber survey meter

Abstract EN

Radiation measuring devices need to process calibration which lose their sensitivity and the extent of the response and the amount of stability under a changing conditions from time to time and this period depends on the nature and use of field in which used devices.

A comparison study was done to a (451P) (ionization chamber survey meter) and this showed the variation of calibration factor in five different years.

This study also displayed the concept of radiation instrument calibration and necessity of every year calibration of them.

In this project we used the five years calibration data for ionization chamber survey meter model Inspector (451P) to get that the values of Calibration Factor (CF) and Response (1/CF).

The value deviation (Δ%) of CFs for four years of calibration in comparison of CF for the year 2007 are very high and the device under research is not good to use in field and reliable because the ionization chamber is very sensitive to humidity and must calibrate a year or less, or during every two years and must maintain carefully to reduce the discarded effects to the measurements.