Multifunctional silicone rubber/paraffin@ PbWO 4 phase‐change composites for thermoregulation and gamma radiation shielding

2020 ◽  
Vol 44 (9) ◽  
pp. 7674-7686 ◽  
Author(s):  
Lan Lou ◽  
Zhiyu He ◽  
Yingjun Li ◽  
Yongsheng Li ◽  
Yuanlin Zhou ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Phase Change ◽  
Silicone Rubber ◽  
Radiation Shielding ◽  
Phase Change Composites

Comparison of Lead, Copper and Aluminium as Gamma Radiation Shielding Material through Experimental Measurements and Simulation Using MCNP Version 4c

2018 ◽  
Vol 9 (08) ◽  
pp. 20193-20206 ◽  
Author(s):  
Md. Akhlak Bin Aziz ◽  
Md. Faisal Rahman ◽  
Md. Mahidul Haque Prodhan
Keyword(s):  
Gamma Radiation ◽  
Sodium Iodide ◽  
Experimental Approach ◽  
Radiation Shielding ◽  
Test Material ◽  
Simulation Techniques ◽  
Radiation Sources ◽  
Simulation Monte Carlo ◽  
Shielding Material ◽  
Code Version

The paper compares  Lead, Copper and Aluminium as gamma radiation shielding material using both experimental and simulation techniques. Cs- 137 (662KeV), Na-22 (511KeV) and Na- 22(1274KeV) were used as gamma radiation sources and a sodium iodide (NaI) detector was used to detect the radiation. Variations were noted for detected gamma count rates by changing shielding material thickness. In the experimental approach, thickness was varied by placing sheets of a particular test material one by one. For simulation, Monte Carlo n- Particle (MCNP) code version 4c was used and the geometry of the whole experimental setup was plotted in it. The results were then compared for each test material and it was found that lead is the best shielding material for gamma radiation followed by copper and aluminium.

Characterization and measurement of gamma radiation shielding of a new tungsten-lignin composite

2021 ◽  
pp. 002199832110293
Author(s):  
Armando Cirilo de Souza ◽  
Flavio Aristone ◽  
Adriana Fatima Gomes Gouvea ◽  
Hedielly Brasil Fernandes ◽  
Adailto Miyai ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Kraft Lignin ◽  
Temperature Treatment ◽  
Radiation Shielding ◽  
X Rays ◽  
Clear Indication ◽  
Pure Tungsten ◽  
Metal Organic ◽  
Gamma Radiations ◽  
Scanning Electron

This research has been carried on to analyze the capability of a new composite to be effectively used as shielding of gamma radiation. The preparation of a metal-organic composite formed by tungsten and Kraft lignin is presented. Samples have been characterized through X-rays and scanning electron microscopy measurements. The results led to the study of the different phase formations. The microscopic analyzes indicate that two different phases are present in the composite. The absence of oxidation in the process even after the temperature treatment imposed to form the sample has also been noticed. Measurements of the attenuation have been performed to study its ability to absorb gamma radiation. A sample of cobalt 60 (Co-60), for which the peak energies are at 1173 keV and 1332 keV, was used as a source of gamma radiation in the experiment of attenuation. The measured attenuation of gamma radiations when the composite is placed to act as a shield is only 16% smaller than the attenuation obtained for standard pure tungsten. This is a clear indication that the new metal-organic composite is suitable for the fabrication of devices dedicated to shielding radiation, with the advantage of being easier to manipulate.

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