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das sopan,김준혁,박재현,장호종,조규성 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.12
Due to its short half-life, thoron gas has been assumed to have negligible health hazards on humans compared to radon. But, one of the decay products with a long half-life can make it to be transported to a long distance and to cause a severe internal dose through respiration. Since most commercial radon detectors can not discriminate thoron signals from radon signals, it is very common to overestimate radon doses which in turn result in biased estimation of lung cancer risk in epidemiological studies. Though some methods had been suggested to measure thoron and radon separately, they could not be used for real-time measurement because of CR-39 or LR-115. In this study, an effective method was suggested to measure radon and thoron separately from the free air. It was observed that the activity of thoron decreases exponentially due to delay time caused by a long pipe between two chambers. Therefore from two ion chambers apart in time, it was demonstrated that thoron and radon could be measured separately and simultaneously. We also developed a collimated alpha source and with this source and an SBD, we could convert the ion chamber reading to count rate in cps.
Ganesh Jethave,Umesh Fegade,Sanjay Attarde,Sopan Ingle 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.53 No.-
New LD-ZAO-NPs was facilely synthesized and characterized by FESEM, XRD, EDX and FT-IR. Under the optimal conditions, the MO removal efficiency reached 99.60% after 30 min, Langmuir isotherm and a pseudo second-order kinetic model showed high performance. The thermodynamic parameters showed that the adsorption was spontaneous and favorable as DG0 is negative and exothermic in nature as DH0 is negative (0.025 kJ/mol). The maximum adsorption capacity (qmax) in single component system 200 mg g1 for MO supports high efficiency of LD-ZAO-NPs as new adsorbent. Altogether, the superior performance of LD-ZAO-NPs was manifested by fast kinetics and high adsorption capacity.