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A simple approach for developing model OF Si(Li) detector in Monte Carlo simulation

Huynh Dinh Chuong, Nguyen Thi Truc Linh, Le Thi Ngoc Trang, Vo Hoang Nguyen, Le Hoang Minh , Chau Thanh Tai, Tran Thien Thanh

Abstract

In this paper, a simple approach for developing the model of a Si(Li) detector in Monte Carlo simulations is presented and validated. Experimental measurements using “point-like” standard radioactive sources including 133Ba, 137Cs, 152Eu, 154Eu, 241Am were performed for both configurations with and without collimator, respectively. The MCNP6 code was used for Monte Carlo simulation of photon transport inside the models constructed similar to these configurations. Firstly, an initial model of the Si(Li) detector was constructed based on the manufacturer's specifications, but the simulated efficiency shows a very high discrepancy from the experiment. Then, the critical geometric parameters of the model of Si(Li) detector were improved step-by-step to achieve the optimized model. For the optimized model, a good agreement was obtained between the experimental and simulated results. The relative deviations of experimental and simulated efficiencies are less than 4% with energies in the range of 12–60 keV for both configurations.

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Technology to measure the flow of subatomic particles known as antineutrinos from nuclear reactors could allow continuous remote monitoring designed to detect fueling changes that might indicate the diversion of nuclear materials. The monitoring could be done from outside the reactor vessel, and the technology may be sensitive enough to detect substitution of a single fuel assembly.

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 Assessment of annual effective dose from radium isotopes in groundwater samples in households along the lower Mekong River

Phan Long Ho, Vu Tuan Minh, Le Dinh Hung, Do Quoc Trung, Dang Van Chinh, Tran Thien Thanh, Chau Van Tao

Abstract

In this study, the 224Ra, 226Ra, 228Ra in groundwater samples at Long Phu district were determined by HPGe detector with co- precipitation method. The median concentrations were 0.040 ± 0.005 Bq L−1, 0.039 ± 0.004 Bq L−1, and 0.049 ± 0.004 Bq L−1. Highest MDC values were 0.028 Bq L−1, 0.010 Bq L−1, 0.018 Bq L−1, respectively. It’s a strong relationship between 224Ra, 228Ra versus conductivity, salinity, TDS, SO42−. The annual e ective dose of the age groups was lower than the WHO rec- ommended value except for infants exceeding around 1.5 times. Besides, the 226Ra minimum recovery obtained was 90% with trueness 9.9% and relative percentage di erence 6.1%.

Keywords Radium isotopes · Groundwater · Co-precipitation method · Gamma spectrometry · Annual e ective dose · Pearson correlation

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DOI:  https://doi.org/10.1007/s10967-019-06699-z

 

 

Researchers show how creating interference patterns with four laser beamlets improves the efficiency of energy transfer when accelerating electron and ion beams. This method can be used to enhance biological and astrophysical research.

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Nuclear power plants can withstand most inclement weather and do not emit harmful greenhouse gases. However, trafficking of the nuclear materials to furnish them with fuel remains a serious issue as security technology continues to be developed. Physicists conducted research to enhance global nuclear security by improving radiation detectors. According to them, improving radiation detectors requires the identification of better sensor materials and the development of smarter algorithms to process detector signals.

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It was the most serious release of radioactive material since Fukushima 2011, but the public took little notice of it: In September 2017, a slightly radioactive cloud moved across Europe. Now, a study has been published, analyzing more than 1300 measurements from all over Europe and other regions of the world to find out the cause of this incident.

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