A. T. Korsakov | Searcharxiv

arXiv2013

Krypton-85 in the atmosphere

Measurement results are presented on 85Kr content in the atmosphere over the European part of Russia in 1971-1995 based on the analysis of the commercial krypton, which is separated from air by industrial plants. Our results are by 15 per cent lower then 85Kr activites observed over West Europe. According our prediction by 2030 85Kr content in the atmosphere over Europe will amount to 1,5-3 Bq in m3 air. Average 85Kr release to the atmosphere from regeneration of spent nuclear fuel (SNF) is estimated, some 180 TBq per a ton SNF. It is advisable to recommence monitoring of 85Kr content within Russia.

physics.ao-ph↗

arXiv2012

Determination of the efficiency of a detector in gamma spectrometry of large-volume samples

The experimental - calculated method is proposed to determine the full energy peak efficiency (FEPE) of detectors ε(E) in case a measurement of the large-volume samples. Water is used as standard absorber in which the linear attenuation coefficients for photons μ0 (E) is well known. The value μ (E) in sample material (matrix of the sample) is determined experimentally by means of spectrometer. The formulas are given for calculation of the ratio ε(E)/ ε0(E), where ε0(E) is FEPE of the detector for photons those are arising in the container filled with water (it is found by adding in the container of the Reference radioactive solutions). To prove the validity of the method ethanol (density 0,8 g/cm3) and water solutions of salts (density 1,2 and 1,5 g/cm3) were used for simulation of the samples with different attenuation coefficients. Standard deviation between experimental and calculated efficiencies has been about 5 %.

physics.ins-det↗