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Optimization of Positron-Lifetime Measurement Geometry Based on Geant4 Simulation

100%

Saro M., Petriska M., Slugeň V.

Acta Physica Polonica A

2017

vol. 132

issue 5

1634-1636

Proper choice of measuring geometry and experimental setup of nuclear instrumentation modules and photomultipliers is a key element which affects substantial positron lifetime measurement properties: count rate and time resolution. An adequate compromise must be found, when it comes to geometry of measurement. The optimal geometry using three detector layout is inspected in this paper. During our work, we concentrated on the simulation of XP2020Q photomultipliers and the BaF₂ scintillator material. The Geant4 simulation allows to estimate an influence of the measuring geometry on detection efficiency and to choose the most appropriate crystals dimensions and positions. As mentioned in paper of Bečvaŕ et al., slight changes in geometry result in distortion or improvement of measured results. Experimental results already showed, changes of start crystals dimensions can result in significant increase in count rate of three-detector measurement.

Production of Barite and Boroncarbide Doped Radiation Shielding Polymer Composite Panels

76%

Evcın O., Evcın A., Bezır N., Akkurt İ., Günoğlu K., Ersoy B.

Acta Physica Polonica A

2017

vol. 132

issue 3

1145-1148

Developments in nuclear technology in the last century have lead to the use of radiation in different areas of human activity. These are not just the energetics but also food, agriculture, medicine, industry and science. Thus, radiation has become an inevitable phenomenon in our lives. Since we cannot isolate radiation from our life, the radiation protection methods should be available. As alternatives to conventional radiation prevention methods, such as lead and heavy concrete shielding, more functional materials need to become the focus of research. The development of the least harmful to the environment, easily applicable, flexible radiation shields has become very important. In this study, silicon matrix composite panels, doped with different ratios of barite and boron carbide, were produced and characterized by optical and scanning electron microscopy (SEM). Gamma and neutron radiation shielding properties of these materials were investigated. The results have been compared with the lead as the standard shielding material.

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2 Acta Physica Polonica A

2 2017

1 Akkurt İ.

1 Bezır N.

1 Ersoy B.

1 Evcın A.

1 Evcın O.

1 Günoğlu K.

1 Petriska M.

1 Saro M.

1 Slugeň V.

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Optimization of Positron-Lifetime Measurement Geometry Based on Geant4 Simulation

Production of Barite and Boroncarbide Doped Radiation Shielding Polymer Composite Panels