Universal calibration of a scintillation spectrometer with a NaI(Tl) detector when measuring 137Cs activity in counting samples of arbitrary density and volume

The article proposes an empirical method for constructing a universal calibration for a scintillation gamma spectrometer, which allows determining the activity and specific activity of 137Cs with an accuracy of no more than 15% in counting samples of arbitrary density and volume in cylindrical containers with a volume of 250 ml and 500 ml. To construct calibration ratios, measurements of 137Cs sample media prepared on the basis of materials of different densities (quartz sand, plastic granules and sawdust) were performed. The calibration was carried out by preparing samples from the listed materials with a volume of 50 to 250 ml in increments of 50 ml for a 250 ml container and 100-500 ml in increments of 100 ml for a 500 ml container. Along with taking into account the volume of the counting sample, its weighing was also carried out. The result of the measurements performed for each material was the ratio of the activity of the counting sample to the counting intensity in the 137Cs window, depending on the volume. The universal calibration factor is obtained by taking into account the counting rate from the mass and volume of the sample for the corresponding measuring vessel.

APPLICATION OF A SCINTILLATION GAMMA-SPECTROMETER FOR DETERMINATION OF RADON CONTENT IN WATER

Experimental studies have been carried out to determine the sensitivity of a mobile scintillation gamma-spectrometer to radon-222 in mineral water samples for the selected measurement geometry and the minimum measurable activity of radon-222 in such samples. The measurement results of radon content in mineral water samples obtained using such gamma-spectrometer are presented too.

Application of the Correction Algorithm Based on the ME-LM Method for Improvement of Peak Identification in the Instrumental Spectrum of the Scintillation Gamma-Radiometer

The paper considers an algorithm for correcting the instrumental spectrum of the gamma-radiometer with a NaI(Tl) detector. The algorithm is based on the ME-LM method (Maximum Likelihood Estimation using Expectation Maximization), which uses a detector response matrix obtained by Monte Carlo simulation. The main advantage of the algorithm is the rescaling procedure, which significantly reduces the spectrum processing time.

DETERMINATION THE ACTIVITY OF THE NATURAL RADIOACTIVE ISOTOPE K-40 AND THE TECHNOGENIC RADIONUCLIDE Cs-137 IN THE TRUNKS AND FRUITS OF PERENNIAL TREES// Journal of Technical and Natural Sciences 2(11), 2019/ OEAPS Inc.(Open European Academy of Public Sciences); Chief Editor Vitaly Yakovlev- Berlin, Germany. 26.02.2019: OEAPS Inc., 2019. - PP.29-33.

In the present work with the help of the scintillation gamma spectrometric method the specific activity of the natural radioactive isotope K-40 and the techno genic radionuclide Cs-137 in the trunks and fruits of perennial trees were determined.

Performance stabilization of scintillation spectrometers for aerosol monitoring

The article presents the results of the development of the scintillation gamma spectrometers, based on NaI(Tl), LaBr3 or SrI2(Eu) scintillators, intended for aerosol monitoring over a wide temperature range. The stabilization of the characteristics is provided by applying various stabilization methods of the spectrometric chain. The estimation of the impact of those methods on the stability of the characteristics of the developed radiation spectrometer is provided.