Abstract
The recent development of instruments for radiation measurement has made measurement of low-level environmental gamma ray dose rates simpler and easier. Many of these instruments are commercially available. However, it is still indispensable to separate unnecessary component from the measured data, or to make appropriate corrections considering the physical meanings of the measured quantity when one trys to measure environmental gamma ray dose rate with high accuracy. In this report, a procedure of data treatment for measurement of environmental gamma ray dose rates with high accuracy using a NaI (T1) scintillation detector and spectrometric techniques is mentioned. It includes separation of unnecessary component involved in the measured pulse height spectra, correction of the angular response of the detector, calibration of the relation between pulse height and gamma ray energy, and the process of data treatment.
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