• Title, Summary, Keyword: 내부피폭

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Evaluation on Safety of Two-bed Therapy Rooms (2인용 치료병실 안전성 평가)

  • Lee, Kyung-Jae;Cho, Hyun-Duck;Oh, Chang-Bum;Ko, Kil-Man;Park, Young-Jae;Lee, In-Won;Ahn, Hee-Yong
    • The Korean Journal of Nuclear Medicine Technology
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    • v.15 no.1
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    • pp.75-80
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    • 2011
  • Purpose: Europe and U.S use multi-bed therapy rooms. Hereupon, this study aims to examine the safety when current one-bed therapy rooms in Seoul National University Hospital is changed into two-bed ones. Materials and Methods: This study evaluated external exposure by gamma radiation emitted from other patients and internal and external exposure caused by pollutions from other patients in case that Seoul National University Hospital installs a shielding wall between beds in existing therapy rooms. Results: When internal and external exposure was evaluated to evaluate safety of two-bed hospital rooms, 'isolation amount of patients' 5mSv exposure or below is received according to the Atomic Energy Act. Conclusion: With the increasing number of patients with thyoid cancer, patients using therapy rooms are on the rise. Therefore, improving one-person therapy rooms to two-person ones in line with international trend would increase cost reduction and management efficiency, and patients' alienation and isolation can be reduced to increase healing effects.

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Analysis of Metabolism and Effective Half-life for Tritium Intake of Radiation Workers at Pressurized Heavy Water Reactor (중수로원전 종사자의 삼중수소 체내섭취에 따른 인체대사모델과 유효반감기 분석)

  • Kim, Hee-Geun;Kong, Tae-Young
    • Journal of Radiation Protection and Research
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    • v.34 no.2
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    • pp.87-94
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    • 2009
  • Tritium is the one of the dominant contributors to the internal radiation exposure of workers at pressurized heavy water reactors (PHWRs). This nuclide is likely to release to work places as tritiated water vapor (HTO) from a nuclear reactor and gets relatively easily into the body of workers by inhalation. Inhaled tritium usually reaches the equilibrium of concentration after approximately 2 hours inside the body and then is excreted from the body with a half-life of 10 days. Because tritium inside the body transports with body fluids, a whole body receives radiation exposure. Internal radiation exposure at PHWRs accounts for approximately 20-40% of total radiation exposure; most internal radiation exposure is attributed to tritium. Thus, tritium is an important nuclide to be necessarily monitored for the radiation management safety. In this paper, metabolism for tritium is established using its excretion rate results in urine samples of workers at PHWRs and an effective half-life, a key parameter to estimate the radiation exposure, was derived from these results. As a result, it was found that the effective half-life for workers at Korean nuclear power plants is shorter than that of International Commission on Radiological Protection guides, a half-life of 10 days.

Gross Alpha Analysis of Nasal Smear Samples and Internal Dose Assessment Procedure in Radiation Emergency (방사선비상시 비강스메어 시료의 전알파 분석 및 내부피폭선량평가 절차)

  • Yoon, Seokwon;Ha, Wi-Ho;Kim, Mee-Ryeong;Lee, Seung-Sook
    • Journal of Radiation Protection and Research
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    • v.37 no.4
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    • pp.226-230
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    • 2012
  • The gross alpha analysis of nasal smear samples for the radiation emergency and the additional follow-up steps were established. Cotton swab sticks using in local hospitals for nasal smear in Korea were used for the verification. The measurement results of standard samples spiked with certified reference source were well agreed within ${\pm}20%$ compared with reference values. The clearance ratio of smear samples conducted with wet smear condition showed higher value. To eliminate the quenching effect of liquid scintillation samples, dry of smear samples should be followed up before counting samples. Based on the measurement results, medical decision levels and internal dose assessment were established for the victims in the beginning of radiation emergency.

Evaluation of Indoor Radon Levels in a Hospital Underground Space and Internal Exposure (의료기관 지하시설의 라돈가스 측정과 내부피폭 조사)

  • Song, Jea-Ho;Jin, Gye-Hwan
    • Journal of the Korean Society of Radiology
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    • v.5 no.5
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    • pp.231-235
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    • 2011
  • Radium is rock or soil of crust or uranium of building materials and thorium after radioactivity collapse process are created colorless and odorless inert gas that accrue well in sealed space like mine or basement. It inflow to lung circulate respiratory organ and caused lung cancer because of deposition of lung or bronchial tubes. Radium sheath of medical institution treat person's life is possible big danger to professional regarding radioactivity who has much amount exposed radioactivity and weaker immune patient. so we do this test. Using measuring instrument at test is real time radium measuring instrument, Professional Continuous Radon monitor, and measuring places are basement first floor and second floor of two hospitals and measure from 10 a.m to 3 p.m. Measurement result of Professional Continuous Radon monitor is minimum 14.8 Bq/$m^3$ to maximum 70.3 Bq/$m^3$ and show domestic baseline below 148 Bq/$m^3$, effective dose-rate is minimum 0.296 mSv to maximum 1.406 mSv that show 2.4 mSv, 10~58.3% level, exposed radiation amount from nature radiation one year.

Enzyme activity changes by intraperitoneal injection of uranium in the carp liver (우라늄 투여후 간조직에서의 효소활성도의 변화)

  • Kim, In-Gyu;Kim, Kug-Chan;Kim, Jin-Kyu;Kim, Sang-Bok;Chun, Ki-Chung;Park, Hyo-Kook;Lee, Kang-Suk
    • Journal of Radiation Protection and Research
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    • v.18 no.2
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    • pp.61-69
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    • 1993
  • We examined various enzyme activity changes by intraperitoneal injection uranium in the carp liver. These enzyme activity changes can be used as biochemical indicators of internal exposure to uranium. The results were followings ; 1) Total protein concentration decreased by intraperitoneal injection in the carp liver. 2) Lysosomal acid pretense and ${\beta}-glucuronidase$ activities increased in the liver until sixth intraperitoneal injection of uranium, but Lysosomal acid phosphatase activities decreased in the liver until the sixth injection of uranium. 3) Alkaline phosphatase activities sharply increased and Glutamate oxaloacetate Transaminase activities steadily decreased in the liver until the sixth injection of uranium. 4) Creatine %kinase activities steadily decreased and malate dehydrogenase activities sharply decreased in the liver after the primary injection of uranium. Any malate dehydrogenase activities was not detected after sixth injection of uranium.

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Performance test of urine bioassay through participation in the NRIP (NRIP 참여를 통한 소변시료 바이오어세이 성능검사)

  • Ha, Wi-Ho;Yoo, Jaeryong;Yoon, Seokwon;Lee, Seung-Sook;Kim, Jong Kyoung
    • Journal of Radiation Protection and Research
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    • v.39 no.2
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    • pp.96-102
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    • 2014
  • Urine bioassay has been widely used for internal dosimetry due to simple process of sampling and measurement. In this paper, we participated in the NRIP (NIST Radiochemistry Intercomparison Program) hosted by US NIST to carry out a reliable performance test of urine bioassay and introduced the measurement method and results of NRIP-2013. In customary exercise with 60 days of reporting time, bioassay results of 12 radionuclides in the synthetic urine samples were acceptable based on the performance criteria of ANSI N13.30. In emergency preparedness exercise with 8 hours of reporting time, bioassay results of 9 radionuclides showed that differences ranged from -35% to 45%. However, we concluded that urine bioassay applied for emergency preparedness exercise would be applicable for rapid screening and estimation of internal exposure within a difference of ${\pm}45%$ in the event of radiological accidents.