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RISS 인기검색어
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- 저자 : Safa Kasap (검색결과 2 건)
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George Belev,Safa Kasap,J.A. Rowlands,David Hunter,Martin Yaffe 한국물리학회 2008 Current Applied Physics Vol.8 No.3,4
Stabilized a-Se lms deposited at suciently low substrate temperatures aren-like in which electrons can drift but holes are deeplytrapped. Such layers can be conveniently incorporated in a multilayer a-Se detector structure to block the injection of holes from thepositive electrode. We have shown that a simple double-layer detector structure based on a cold depositedn-layer (which is thenannealed) on which an i-like layer is grown can have dark current densities lower than 10. 10 Acm. 2 at a eld of 10 V/l m. The darkcurrent depends on the thickness of then-like layer. An a-Se X-ray detector for slot scanning was fabricated by having thein a-Se photo-conductor structure coated onto a CCD chip. The latter detector was shown to have excellent resolution with a modulation transfer func-tion remaining above 0.5 up to a spatial frequency of 11-14 lp mm-¹
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X-ray induced effects in Sm3+-doped ZnO-P2O5 glass for radiation measurements
Go Okada,Hirokazu Masai,Aya Torimoto,Safa Kasap,Takayuki Yanagida 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
We have studied X-ray induced effects on ZnO-P2O5 glass doped with Sm3+ ion. The glass was synthesized by a conventionalmelt-quenching method in an ambient atmosphere. We have investigated the following three different effects induced by Xrayirradiation in this glass, which can be used for radiation sensing applications. First, although the as-prepared glass sampleis highly transparent and homogeneous, upon irradiation with X-rays, the sample becomes slightly brownish due to anappearance of color centers induced by X-ray irradiation which can be measured as an optical absorption in the UV-Vis range. By utilizing the extent of absorption change by X-ray irradiation, it is possible to measure the incident radiation dose fromabout 0.5 to over 20 Gy. Second, with the Sm3+ ion included as a luminescent centre, the glass sample emits orange-red lightupon X-ray irradiation. The integrated light emission is proportional to the incident X-ray dose, hence it can be used as ascintillator plate for online radiation monitoring. The confirmed exposure dose detection range for this use is approximately1 -300 R. Last, when an irradiated sample is heated at elevated temperatures from 100 to 400 oC, it shows a thermallystimulatedluminescence (TSL). The emission intensity increases with the accumulated X-ray dose delivered prior to themeasurement, so our sample has a function to act as a TSL dosimeter as well. Over the radiation dose range we have tested,the X-ray induced effects above show linear response against the incident dose. The linear response is of particular importancefor dosimetry applications since it enables us to calibrate the response of sample to radiation dose with high accuracy.
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