• Asian Pacific Journal of Cancer Prevention
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• 제14권11호
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• pp.6301-6304
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• 2013

Background: Some epidemiological studies reported that sunlight exposure and highvitamin D levels may decrease the morbidity and mortality related to cancer. We aimed to evaluate whether sunlight exposure has an impact on survival in patients with non small cell lung cancer. Materials and Methods: A total of 546 patients with NSCLC from two different regions (Kayseri and Adana) differing according to sunlight exposure were analysed retrospectively. Results: The median overall survival (OS) rates were 11. 6 (CI: 9.50-13.6) and 15.6 months (CI: 12.4-18.8) for Kayseri and Adana, respectively, in all patients (p=0.880). Conclusions: There were no differences between groups in terms of OS. While there is strong evidence regarding inverse relationship between cancer incidence and sunlight exposure, it is still controversial whether sunlight exposure is a good prognostic factor for survival in patients with lung cancer.

• 대한방사선기술학회지:방사선기술과학
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• 제44권5호
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• pp.495-502
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• 2021

This study aims to provide basic data for elderly health insurance policy and medical radiation safety management by analyzing the general radiography usage and exposure dose of the elderly in Korea. The effective dose for each general radiography was calculated using the ALARA-GR program for 260 general radiography codes selected from 'National Health Insurance Care Benefit Cost'. The usage of general radiography was analyzed in the 2016 elderly patient data of the Health Insurance Review and Assessment Service, and the effective dose for each general radiography was applied. The general radiography usage and exposure dose per person aged 65 years and over was 6.47 cases and 0.56 mSv. Females showed higher value than males as 7.15 cases and 0.66 mSv(p<.001). By age, those between 75 and 79 showed the highest number as 6.97 cases and 0.62 mSv(p<.001). Those who were supported by Medical Aid showed higher value than those who were insured by National Health Insurance as 8.82 cases and 0.76 mSv(p<.001). In addition, the ratio by radiography was in the order of Chest 20.85%, Knee Joint 15.58%, and L-spine 14.67%, and the exposure dose was L-spine 29.40%, Chest 15.82%, Abdomen 7.97%, and Entire Spine 7.20%. General radiography, which is widely used due to the high frequency of diseases in the elderly population should be taken into consideration when establishing health insurance policies. In addition, it is necessary to check whether the general radiography with high exposure dose is performed as a routine examination without considering medical necessity.

• 한국방사선학회논문지
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• 제9권1호
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• pp.17-21
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• 2015

최근 고령화 사회에 접어들고 있는 의료현장에서 치아건강에 대한 관심이 커지면서 진단을 위한 치아 방사선 검사의 횟수가 증가하고 있다. 이는 국민 전체의 방사선피폭량 또한 증가하고 있다고 볼 수 있다. 또한 치과방사선에 대한 국민들의 방사선 피폭에 대한 관심도 증가하고 있어 치과 파노라마 촬영장치에 대한 기본 데이터 확보와 이에 대한 조사 및 선량의 측정이 필요하다. 본 연구에서는 ALOKA PDM-117 선량계를 이용하여 치과파노라마장치(VATEC Pax-400)에서 발생되는 2차원적인 선량분포도를 측정하고 그 분포에 대한 평가를 환자의 방사선피폭 차원에서 확인하였다. 치과파노라마장치의 선량분포는 치아부분 이외에도 턱과 안면부위에서 높았으며 산란선의 영향까지 고려한다면 방사선에 민감한 수정체에까지 불필요한 방사선의 피폭됨을 알 수 있었다. 본 연구 결과는 다양한 크기의 검사체와 선량 측정위치에서 보다 정확한 선량평가를 하는데 매우 유용하게 이용될 것으로 사료된다.

• 미생물학회지
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• 제12권2호
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• pp.69-69
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• 1974

This experiment was carried out to identify and to compare the radiosensitivities of bacteriz isolated from the sources of different radiation exposure histories. Among 10 strains isolated in this investigation, 4 strains of bacteria, Bacillus firmus, Bacillus brevis, Baciilus subtilis and Bacillus sphaericus were isolated from high and low radioactive sites simulaneously. Bacterial strains isolated from radioactive sources such as reactor and isotope production rooms were more resistant to irradiation than the microganisms from medical products and laboratories, however, there was no significance in radiosensitivity in the same species of bacteriz, even if they were isolated from different radiation exposure histories.

• Journal of Radiation Protection and Research
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• 제43권1호
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• pp.20-28
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• 2018

Background: Heat energy produced in nuclear reactors and nuclear fuel cycle facilities interactions modifies the physical properties of the shielding materials containing water content. Therefore, in the present paper, effect of the heat on shielding effectiveness of the concretes is investigated for gamma and neutron. The mass attenuation coefficients, effective atomic numbers, fast neutron removal cross-section and exposure buildup factors. Materials and Methods: The mass attenuation coefficients, effective atomic numbers, fast neutron removal cross-section and exposure buildup factors of ordinary and heavy concretes were investigated using NIST data of XCOM program and Geometric Progression method. Results and Discussion: The improvement in shielding effectiveness for photon and reduction in fast neutron for ordinary concrete was observed. The change in the neutron shielding effectiveness was insignificant. Conclusion: The present investigation on interaction of gamma and neutron radiation would be very useful for assessment of shielding efficiency of the concrete used in high temperature applications such as reactors.

• 한국방사선학회논문지
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• 제17권2호
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• pp.249-255
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• 2023

본 연구는 방사선작업종사자, 방사선관계종사자 그룹의 방사선사들과 수시출입자로 분류된 예비 방사선사인 재학생의 임상실습 과정에서의 피폭선량을 측정하였다. 2021년 1월부터 1년 동안 인천소재의 C 대학병원의 방사선구역에서 근무하였던 방사선사들과 동 의료기관에서 7월 1일부터 8월 31일까지 임상실습을 이수한 121명의 학생들을 연구대상으로 하였다. 방사선 피폭선량으로 인하여 손상위험장기인 폐의 피폭선량으로 인한 부작용 발생확률을 평가하기 위하여 ICRP 103^[12]에 의거한 명목위험계수(Nominal Risk Factor)를 사용하였다. 임상실습기간 중 수시출입자로 분류된 방사선(학)과 학생들의 표층선량은 0.98 ± 0.14 mSv, 심부선량은 0.93 ± 0.14 mSv였다. 즉, 표층선량은 1,000,000당 6.7명, 심부선량은 6.4명이 폐의 피폭선량으로 인한 부작용 발생률이 있음이 나타났다. 이는 1년 피폭선량의 환산 값으로 방사선(학)과 교육과정이 3년 혹은 4년임을 고려하였을 때, 임상실습을 나가는 예비 방사선종사자들에 대한 체계적인 관리와 관심이 필요하며, 방사선의 확률적 영향과 관련하여 방사선 안전관리를 위한 기초자료로 활용될 것으로 사료된다.

• 한국콘텐츠학회논문지
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• 제14권11호
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• pp.864-870
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• 2014

선량계 유용성을 평가하기 위한 방법으로 방사선관계종사자의 피폭선량을 측정하여 개인피폭관리를 위한 선량계 선택의 기초 자료를 제시하고자 하였다. 2012년 1년간 방사선사 30명을 대상으로 하였으며 개인피폭 누적선량을 측정하여 열형광선량계, 형광유리선량계, 광자극발광선량계의 성능을 조사하였다. 연구방법으로는 DAP와 ion-chamber를 이용하여 세종류 개인피폭선량계의 선량측정값을 비교 분석하였으며 의료기관별, 검사업무별, 분기별 방사선관계종사자의 피폭누적선량을 확인하였다. 결과적으로 직접 X선조사를 통한 개인피폭선량계의 선량값과 ion-chamber의 절대값에서 광자극발광선량계가 열형광선량계나 형광유리선량계에 비해 더 유사한 선량값을 나타내 측정 능력면에서 더 우수한 결과를 나타냈다. 또한 방사선발생구역에서 방사선관계종사자의 피폭선량이 광자극발광선량계에서 보다 높게 나타났다.

• 한국의학물리학회지:의학물리
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• 제33권4호
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• pp.53-62
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• 2022

In this study, we have investigated the shielding evaluation methodology for facilities using kV energy generators. We have collected and analysis of safety evaluation criteria and methodology for overseas facilities using radiation generators. And we investigated the current status of shielding evaluation of domestic industrial radiation generators. According to the statistical data from the Radiation Safety Information System, as of 2022, a total of 7,679 organizations are using radiation generating devices. Among them, 6,299 facilities use these devices for industrial purposes, which accounts for a considerable portion of radiation. The organizations that use these devices evaluate whether the exposure dose for workers and frequent visitors is suitable as per the limit regulated by the Nuclear Safety Act. Moreover, during this process, the safety shields are evaluated at the facilities that use the radiation generating devices. However, the facilities that use radiating devices having energy less than or equal to 6 MV for industrial purposes are still mostly evaluated and analyzed according to the National Council on Radiation Protection and Measurements 49 (NCRP 49) report published in 1976. We have investigated the technical standards of safety management, including the maximum permissible dose and parameters assessment criteria for facilities using radiation generating devices, based on the NCRP 49 and the American National Standards Institute/Health Physics Society N.43.3 reports, which are the representative reports related to radiation shielding management cases overseas.

• Journal of Ginseng Research
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• 제33권2호
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• pp.132-138
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• 2009

Previous studies suggest that even low-dose irradiation can lead to progressive cognitive decline and memory deficits, which implicates, in part, hippocampal dysfunction in both humans and experimental animals. In this study, whether red ginseng (RG) could attenuate memory impairment was investigated through a passive-avoidance and object recognition memory test, as well as the suppression of hippocampal neurogenesis, using the TUNEL assay and immunohistochemical detection with markers of neurogenesis (Ki-67 and doublecortin (DCX)) in adult mice treated with a relatively low-dose exposure to gamma radiation (0.5 or 2.0 Gy). RG was administered intraperitonially at a dosage of 50 mg/kg of body weight, at 36 and 12 h pre-irradiation and at 30 minutes post-irradiation, or orally at a dosage of 250 mg! kg of body weight/day for seven days before autopsy. In the passive-avoidance and object recognition memory test, the mice that were trained for one day after acute irradiation (2 Gy) showed significant memory deficits compared with the sham controls. The number of TUNEL-positive apoptotic nuclei in the dentate gyrus (DG) was increased 12 h after irradiation. In addition, the number of Ki-67- and DCX-positive cells was significantly decreased. RG treatment prior to irradiation attenuated the memory defect and blocked apoptotic death as well as a decrease in the Ki-67- and DCX-positive cells. RG may attenuate memory defect in a relatively low-dose exposure to radiation in adult mice, possibly by inhibiting the detrimental effect of irradiation on hippocampal neurogenesis.

• 방사선산업학회지
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• 제11권3호
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• pp.123-130
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• 2017

Concerns about high radiation exposure to the hands of radiation workers who may contact with radioactive contamination on surfaces in a nuclear power plant (NPP) had been raised, and the Korean regulatory body required the extremity dose estimation during contact tasks with radioactive materials. Korean NPPs conducted field tests to identify the incident radiation to the hands of radiation workers who may contact with radioactive contamination during maintenance periods. The results showed that the radiation fields for contact tasks are dominated by high energy photons. It was also found that the radiation doses to the hands of radiation workers in Korean NPPs were much less than the annual dose limits for extremities. This approach can be applicable to measure and estimate the extremity dose to the hands of medical workers who handle the radioactive materials in a hospital.