Abstract
The radioactive certified reference materials (RCRMs) have a very important role in the calibration of radiation protection instruments at nuclear power plants (e. g. surface contamination monitors, semiconductor spectrometers). In addition to the activity (or radioactivity concentration) as certified values, the radioactive impurity is also an important characteristic of RCRMs. In our office a suitable semiconductor beta-ray spectrometer has been developed for measurement of beta-emitting impurities. A short review will be given of the construction and the main characteristics of the beta-ray spectrometer. The computer aided evaluation of beta spectra with the method of “spectrum-splitting” will also be outlined. At last the results of simulation tests and the impurity determination of different radioactive sources will be discussed.
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