Pui Sudchai | Burapha University (original) (raw)
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Papers by Pui Sudchai
Progress in Nuclear Science and Technology, 2012
Bulletin of the Department of Medical Sciences วารสารกรมวิทยาศาสตร์การแพทย์, Nov 6, 2013
Physica Medica
To determine the eye lens dose of the Interventional Cardiology (IC) personnel using optically st... more To determine the eye lens dose of the Interventional Cardiology (IC) personnel using optically stimulated luminescent dosimeter (OSLD) and the prevalence and risk of radiation - associated lens opacities in Thailand. 48 IC staff, with age- and sex- matches 37 unexposed controls obtained eye examines. Posterior lens change was graded using a modified Merriam-Focht technique by two independent ophthalmologists. Occupational exposure (mSv) was measured in 42 IC staff, using 2 OSLD badges place at inside lead apron and at collar. Annual eye lens doses (mSv) were also measured using 4 nanoDots OSL placed outside and inside lead glass eyewear. The prevalence of radiation-associated posterior lens opacities was 28.6% (2/7) for IC, 19.5% (8/41) for nurses, and 2.7% (1/37) for controls. The average and range of annual whole body effective dose, Hp(10), equivalent dose at skin of the neck, Hp(0.07) and equivalent dose at eye lens, Hp(3) were 0.80 (0.05-6.79), 5.88 (0.14-35.28), and 5.73 (0.14-33.20) mSv respectively. The annual average and range of eye lens dose using nano Dots OSL showed the outside lead glass eyewear on left and right sides as 8.06 (0.17-32.45), 3.55(0.06-8.04) mSv and inside left and right sides as 3.91(0.05-14.26) and 2.44(0.06-6.24) mSv respectively. Eye lens doses measured by OSLD badges and nano Dot dosimeter as Hp(10), Hp(0.07) and Hp(3). The eyes of the IC personnel were examined annually by two ophthalmologists for the prevalence of cataract induced by radiation.
After changing the whole body occupational radiation service system, for the whole 30,000 radiati... more After changing the whole body occupational radiation service system, for the whole 30,000 radiation workers in Thailand, from film badge to Inlight Optically Stimulated Luminescence (Inlight OSL) in 2009, nanoDot OSL type was selected to use for extremity monitoring service. Each nanoDot OSL dosimeter covered with thin Mylar filter is placed on special ring fitted for finger or wrist. Extremity monitoring service is divided into two groups. One concerns with photon radiation and another one concerns with beta radiation. Sensitivity or correction factor of nanoDot dosimeters correspond to beam qualities have been given in the built-in software of the MicroStar reader. Sensitivities for photon beam qualities are enough to use in the service but are not enough for beta radiation. In this study, first, photon dose evaluation of those workers working in interventional radiation concerning with x-ray were validated. Relative response of Hp(0.07) from nanoDots attached on rod and pillar PMMA phantom conformed to ISO 4037 were studied. Photon energy 16, 24 65 and 100 keV from standard X-ray generator and 662 keV from Cs-137 were used. All measurements were carried out at Secondary Standard Dosimetry Laboratory (SSDL), Department of Medical Sciences, Ministry of Public Health. The results were shown that percentage difference between delivered dose and evaluated dose at each beam quality energy were found to be not exceed 22,48 % and -17.51 % for rod and pillar phantom respectively while the coefficient of variance or precision of all beam quality were found to be less than 10 %. Secondly, Hp(0.07) evaluation for beta radiation using in nuclear medicine, nanoDot dosimeters were sent to irradiate with standard beta sources at PTB Germany. Irradiation were performed on rod phantom in term of Hp(0.07) with dose 15 mSv using Pm-147, Kr-85, Sr-90/Y-90 and Ru-106. Counts reading from all irradiated nanoDot dosimeters were used to plot beta relative energy response. Sensitivities of nanoDot dosimeters corresponded to standard beta source were also calculated. Hp(0.07) evaluation from field source which are the same type as PTB standard beta sources can be evaluated directly while other beta sources evaluation can be evaluated using sensitivities from those relative response curve.
Progress in Nuclear Science and Technology, 2012
Bulletin of the Department of Medical Sciences วารสารกรมวิทยาศาสตร์การแพทย์, Nov 6, 2013
Physica Medica
To determine the eye lens dose of the Interventional Cardiology (IC) personnel using optically st... more To determine the eye lens dose of the Interventional Cardiology (IC) personnel using optically stimulated luminescent dosimeter (OSLD) and the prevalence and risk of radiation - associated lens opacities in Thailand. 48 IC staff, with age- and sex- matches 37 unexposed controls obtained eye examines. Posterior lens change was graded using a modified Merriam-Focht technique by two independent ophthalmologists. Occupational exposure (mSv) was measured in 42 IC staff, using 2 OSLD badges place at inside lead apron and at collar. Annual eye lens doses (mSv) were also measured using 4 nanoDots OSL placed outside and inside lead glass eyewear. The prevalence of radiation-associated posterior lens opacities was 28.6% (2/7) for IC, 19.5% (8/41) for nurses, and 2.7% (1/37) for controls. The average and range of annual whole body effective dose, Hp(10), equivalent dose at skin of the neck, Hp(0.07) and equivalent dose at eye lens, Hp(3) were 0.80 (0.05-6.79), 5.88 (0.14-35.28), and 5.73 (0.14-33.20) mSv respectively. The annual average and range of eye lens dose using nano Dots OSL showed the outside lead glass eyewear on left and right sides as 8.06 (0.17-32.45), 3.55(0.06-8.04) mSv and inside left and right sides as 3.91(0.05-14.26) and 2.44(0.06-6.24) mSv respectively. Eye lens doses measured by OSLD badges and nano Dot dosimeter as Hp(10), Hp(0.07) and Hp(3). The eyes of the IC personnel were examined annually by two ophthalmologists for the prevalence of cataract induced by radiation.
After changing the whole body occupational radiation service system, for the whole 30,000 radiati... more After changing the whole body occupational radiation service system, for the whole 30,000 radiation workers in Thailand, from film badge to Inlight Optically Stimulated Luminescence (Inlight OSL) in 2009, nanoDot OSL type was selected to use for extremity monitoring service. Each nanoDot OSL dosimeter covered with thin Mylar filter is placed on special ring fitted for finger or wrist. Extremity monitoring service is divided into two groups. One concerns with photon radiation and another one concerns with beta radiation. Sensitivity or correction factor of nanoDot dosimeters correspond to beam qualities have been given in the built-in software of the MicroStar reader. Sensitivities for photon beam qualities are enough to use in the service but are not enough for beta radiation. In this study, first, photon dose evaluation of those workers working in interventional radiation concerning with x-ray were validated. Relative response of Hp(0.07) from nanoDots attached on rod and pillar PMMA phantom conformed to ISO 4037 were studied. Photon energy 16, 24 65 and 100 keV from standard X-ray generator and 662 keV from Cs-137 were used. All measurements were carried out at Secondary Standard Dosimetry Laboratory (SSDL), Department of Medical Sciences, Ministry of Public Health. The results were shown that percentage difference between delivered dose and evaluated dose at each beam quality energy were found to be not exceed 22,48 % and -17.51 % for rod and pillar phantom respectively while the coefficient of variance or precision of all beam quality were found to be less than 10 %. Secondly, Hp(0.07) evaluation for beta radiation using in nuclear medicine, nanoDot dosimeters were sent to irradiate with standard beta sources at PTB Germany. Irradiation were performed on rod phantom in term of Hp(0.07) with dose 15 mSv using Pm-147, Kr-85, Sr-90/Y-90 and Ru-106. Counts reading from all irradiated nanoDot dosimeters were used to plot beta relative energy response. Sensitivities of nanoDot dosimeters corresponded to standard beta source were also calculated. Hp(0.07) evaluation from field source which are the same type as PTB standard beta sources can be evaluated directly while other beta sources evaluation can be evaluated using sensitivities from those relative response curve.