Single phases of ammonium penta and tetra molybdates were prepared. The massic heat capacities at normal pre ssure below their decomposition temperatures were measured by drop method. The relationships of the massic h...Single phases of ammonium penta and tetra molybdates were prepared. The massic heat capacities at normal pre ssure below their decomposition temperatures were measured by drop method. The relationships of the massic heat capacities of ammonium molybdates with those of the decomposition products were also discussed. The results show that the massic heat capacities of ammonium molybdates can be estimated by adding together contributions from their decomposition products, and the less change of chemical bonds, the more accurate of the estimation.展开更多
Objective:To determine the radium-226 activity concentration,the massic radon exhalation rate and emanation factor of 55 soil samples from the Central Transdanubian Mountains in Hungary as well as possible radon exhal...Objective:To determine the radium-226 activity concentration,the massic radon exhalation rate and emanation factor of 55 soil samples from the Central Transdanubian Mountains in Hungary as well as possible radon exhalation hotspots in the sampling area were determined.Further indoor measurements are planned to investigate the possible exposure to radon of the inhabitants.Methods:The radium-226 activity concentration measurements were carried out with a semiconductor HPGe gamma-ray spectrometer.The massic radon exhalation rate and emanation factor were determined by measuring the radon activity concentrations using the accumulation method with a system developed by our department based on an AlphaGUARD DF2000 portable radon monitor.Results:The activity concentrations of radium-226 were between(11.42.5)and(118.23.0)Bq/kg,while their average was 39.51 Bq/kg.The massic radon exhalation rates were between(1.023.64)mBq⋅kg1⋅h1 and(275.634.05)mBq⋅kg1⋅h1,while their average was 39.51 mBq⋅kg1⋅h1.Finally,the emanation factors were between(0.010.04)and(0.800.03)with an average of 0.30.Conclusions:In our study,the results recorded from the bedrock at the sampling sites were analyzed.9 samples were taken from sites comprised of limestone bedrock,moreover,the average radium-226 activity concentrations and massic radon exhalation rates at these sampling sites were higher than average.It was also concluded that although no regional correlation can be seen from the results,a possible smaller radon hotspot was identified from our measurements where further sampling will be carried out.展开更多
文摘Single phases of ammonium penta and tetra molybdates were prepared. The massic heat capacities at normal pre ssure below their decomposition temperatures were measured by drop method. The relationships of the massic heat capacities of ammonium molybdates with those of the decomposition products were also discussed. The results show that the massic heat capacities of ammonium molybdates can be estimated by adding together contributions from their decomposition products, and the less change of chemical bonds, the more accurate of the estimation.
基金Project nos.K146322&K146315 were implemented with financial support provided by the Hungarian Ministry of Culture and Innovation from the National Research,Development and Innovation Fund financed under the OTKA K_23 funding scheme,Hungary.
文摘Objective:To determine the radium-226 activity concentration,the massic radon exhalation rate and emanation factor of 55 soil samples from the Central Transdanubian Mountains in Hungary as well as possible radon exhalation hotspots in the sampling area were determined.Further indoor measurements are planned to investigate the possible exposure to radon of the inhabitants.Methods:The radium-226 activity concentration measurements were carried out with a semiconductor HPGe gamma-ray spectrometer.The massic radon exhalation rate and emanation factor were determined by measuring the radon activity concentrations using the accumulation method with a system developed by our department based on an AlphaGUARD DF2000 portable radon monitor.Results:The activity concentrations of radium-226 were between(11.42.5)and(118.23.0)Bq/kg,while their average was 39.51 Bq/kg.The massic radon exhalation rates were between(1.023.64)mBq⋅kg1⋅h1 and(275.634.05)mBq⋅kg1⋅h1,while their average was 39.51 mBq⋅kg1⋅h1.Finally,the emanation factors were between(0.010.04)and(0.800.03)with an average of 0.30.Conclusions:In our study,the results recorded from the bedrock at the sampling sites were analyzed.9 samples were taken from sites comprised of limestone bedrock,moreover,the average radium-226 activity concentrations and massic radon exhalation rates at these sampling sites were higher than average.It was also concluded that although no regional correlation can be seen from the results,a possible smaller radon hotspot was identified from our measurements where further sampling will be carried out.
