抄録
A calibration method has been studied for the surveymeters used for estimating the doses from skin contamination. Two types of surveymeters with ionization chamber and GM tube were calibrated with newly developed β-ray sources simulating skin contamination. Ion-exchange membrane sources were used for preparation of the calibration sources. The tissue absorbed dose rates from the sources were directly determined with an extrapolation chamber.
The ratios of the reading of surveymeter to the dose rate from the sources were measured about maximum β-ray energy, active area and source-to-detector distance. The ratios for the infinite plane source were reasonably determined with 6 calibration sources and many small membrane sources. Through the calibration works, the validity and reliability of this method were discussed.
