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Effect of Thermal Annealing on the Sensitivity of Makrofol-DE Polycarbonate

100%
Kahraman A., Poffijn A., Kaynak G.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 2
271-274
EN
Solid state nuclear track detectors have been applied in different studies including nuclear physics, particle physics, archaeology etc. Makrofol, a particular group of thermoplastic polymers, is used for radon detection. High background track numbers in the foils cause big uncertainties for places where the radon concentrations are quite low. Therefore, it is of great importance to lower the background track signal as much as possible, without reducing the sensitivity of the foils. The present study reports track density and sensitivity of Makrofol-DE after thermal annealing. The unexposed foils were heated at temperatures ranging from 110C to 140C for 10 min with the aim of observing changes in the number of background tracks. As a result a reduction in the background track density was observed. In order to observe the change in the sensitivity, pre-heated and unheated foils were exposed to alpha radiation in a radon chamber. At the temperatures of 110, 120, and 130°C, the track density in the heated and unheated exposed foils is quite similar. An increase was observed in the track density in heated exposed foils at 140C.
2
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Measurement of Radon Level in Dwellings of the Yıldırım County in Bursa

100%
Kahraman A., Poffijn A., Kaynak G.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 2
268-270
EN
It was well known that inhalation of high levels of radon can lead to lung cancer. Indoor radon concentration measurements were carried out in randomly selected 18 dwellings of Yıldırım county in Bursa, Turkey using Makrofol-DE Solid State Nuclear Track Detectors. The results of the radon measurements ranged from 13 to 98 Bq m^{-3}, with as 42 Bq m^{-3} average value. The range of annual effective dose was between 0.33 and 2.47 mSv y^{-1}.
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The Investigation of Radionuclide Concentrations in Soil and Lifetime Cancer Risk Due to Gamma Radioactivity in Zonguldak, Turkey

88%
Koray A., Akkaya G., Kahraman A., Kaynak G., Baldık R.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 3
1122-1125
EN
The distributions of ²²⁶Ra, ²³²Th, ⁴⁰K and ¹³⁷Cs activity concentrations were determined using a high-purity germanium detector in uncultivated surface soil samples collected from Zonguldak. The range of ²²⁶Ra, ²³²Th, ⁴⁰K and ¹³⁷Cs activity concentrations varied from 10.5 ± 2.0 to 98.0 ± 4.3 Bq kg¯¹ (mean value 28.8± 4 Bq kg¯¹), from 12.9 ± 3.4 to 53.2 ± 5.1 Bq kg¯¹ (mean value 29.6± 3 Bq kg¯¹), from 190 ± 22 to 808 ± 43 Bq kg¯¹ (mean value 395± 31 Bq kg¯¹) and from <0.5 to 47.1± 3.8 Bq kg¯¹ (mean value 12.5± 2 Bq kg¯¹), respectively. In addition, the mean outdoor absorbed dose rates in air (terrestrial, terrestrial+cosmic), annual effective dose equivalent, radium equivalent activity and external hazard index were found to be 48 nGy h¯¹ (terrestrial), 56 nGy h¯¹ (terrestrial+cosmic), 58 μSv y¯¹, 101 Bq kg¯¹ and 0.27, respectively. The evaluated excess lifetime cancer risks (ELCRs) varied from 0.13× 10¯³ to 0.36× 10¯³ with a mean value of 0.20× 10¯³.
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