Optimal Monitoring Intervals and MDA Requirements for Routine Individual Monitoring of Occupational Intakes Based on the ICRP OIR

Ha, Wi-Ho,Kwon, Tae-Eun,Jin, Young Woo The Korean Association for Radiation Protection 2020 방사선방어학회지 Vol.45 No.2

Background: The International Commission on Radiological Protection (ICRP) has recently published report series on the occupational intakes of radionuclides (OIR) for internal dosimetry of radiation workers. In this study, the optimized monitoring program including the monitoring interval and the minimum detectable activity (MDA) of major radionuclides was suggested to perform the routine individual monitoring of internal exposure based on the ICRP OIR. Materials and Methods: The derived recording levels and the critical monitoring quantities were reviewed from international standards or guidelines by the International Atomic Energy Agency (IAEA), the International Organization for Standardization (ISO), and the European Radiation Dosimetry Group (EURADOS). The OIR data viewer provided by ICRP was used to evaluate the monitoring intervals and the MDA, which are derived from the reference bioassay functions and the dose coefficients. Results and Discussion: The optimal monitoring intervals were determined taking account of two requirement conditions on the potential intake underestimation and the MDA values. The MDA requirement values of the selected radionuclides were calculated based on the committed effective dose from 0.1 mSv to 5 mSv. The optimized routine individual monitoring program was suggested including the optimal monitoring intervals and the MDA requirements. The optimal MDA values were evaluated based on the committed effective dose of 0.1 mSv. However, the MDA can be adjusted considering the practical operation of the routine individual monitoring program in the nuclear facilities. Conclusion: The monitoring intervals and the MDA as crucial factors for the routine monitoring were described to suggest the optimized routine individual monitoring program of the occupational intakes. Further study on the alpha/beta-emitting radionuclides as well as short lived gamma-emitting nuclides will be necessary in the future.

Optimization of In-Vivo Monitoring Program for Radiation Emergency Response

Wi-Ho Ha,Jong Kyung Kim 대한방사선방어학회 2016 방사선방어학회지 Vol.41 No.4

Optimization of In-vivo Monitoring Program for Radiation Emergency Response

Ha, Wi-Ho,Kim, Jong Kyung The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.4

Background: In case of radiation emergencies, internal exposure monitoring for the members of public will be required to confirm internal contamination of each individual. In-vivo monitoring technique using portable gamma spectrometer can be easily applied for internal exposure monitoring in the vicinity of the on-site area. Materials and Methods: In this study, minimum detectable doses (MDDs) for $^{134}Cs$, $^{137}Cs$, and $^{131}I$ were calculated adjusting minimum detectable activities (MDAs) from 50 to 1,000 Bq to find out the optimal in-vivo counting condition. DCAL software was used to derive retention fraction of Cs and I isotopes in the whole body and thyroid, respectively. A minimum detect-able level was determined to set committed effective dose of 0.1 mSv for emergency response. Results and Discussion: We found that MDDs at each MDA increased along with the elapsed time. 1,000 Bq for $^{134}Cs$ and $^{137}Cs$, and 100 Bq for $^{131}I$ were suggested as optimal MDAs to provide in-vivo monitoring service in case of radiation emergencies. Conclusion: In-vivo monitoring program for emergency response should be designed to achieve the optimal MDA suggested from the present work. We expect that a reduction of counting time compared with routine monitoring program can achieve the high throughput system in case of radiation emergencies.

RAPID MONITORING OF INTERNAL CONTAMINATION USING A MOBILE RADIOBIOASSAY LABORATORY FOLLOWING RADIATION EMERGENCIES

Ha, Wi-Ho,Kwon, Tae-eun,Kim, Jewan,Jin, Young Woo Oxford University Press 2018 Radiation protection dosimetry Vol.182 No.1

12주간의 복합운동이 비만여성의 신체조성, 체력 및 대사증후군에 미치는 영향

하창호(Ha, Chang-Ho),하성(Ha, Sung),소위영(So, Wi-Young) 한국보건간호학회 2012 韓國保健看護學會誌 Vol.26 No.3

Purpose: The purpose of this study was to examine the effect of a 12-week combined exercise training program on the body composition, physical fitness levels, and metabolic syndrome profiles of obese women. Methods: Twelve obese women were assigned to the combined exercise training program group. The women underwent training for 70?90 min/d, three times per week for a period of 12 weeks. Paired samples t-tests were performed using SPSS ver. 17.0 for analysis of the results. Results: The results of this study showed that body-composition parameters such as weight, fat-free mass, body fat mass, body-mass index, body fat, waist-hip ratio, basal metabolic rate, and intra-abdominal fat, physical fitness parameters such as muscle strength, muscle endurance, flexibility, and cardiac endurance, and metabolic syndrome biomarkers such as triglyceride levels, high-density lipoprotein cholesterol levels, glucose levels, systolic blood pressure, and waist circumference before participation the training program differed significantly from those after participation in the training program (p<0.05). However, diastolic blood pressure before participation in the training program did not differ significantly from that after participation in the training program (p>0.05). Conclusion: We concluded that a 12-week combined exercise training program could be a good exercise program for improvement of the body composition, physical fitness levels, and metabolic syndrome profiles of obese women.

Prediction of Contrast-Induced Nephropathy With Persistent Renal Dysfunction and Adverse Long-term Outcomes in Patients With Acute Myocardial Infarction Using the Mehran Risk Score.

Wi, Jin,Ko, Young-Guk,Shin, Dong-Ho,Kim, Jung-Sun,Kim, Byeong-Keuk,Choi, Donghoon,Ha, Jong-Won,Hong, Myeong-Ki,Jang, Yangsoo Foundation for Advances in Medicine and Science [e 2013 Clinical cardiology Vol.36 No.1

<P>Contrast-induced nephropathy (CIN) has been generally considered to be transient and associated with unfavorable clinical outcomes.</P>

넙치 (Paralichtys olivaceus) 유래 viral hemorrhagic septicemia virus (VHSV, genotype IVa)의 무지개송어 (Oncorhynchus mykiss) 감염 실험

김위식 ( Wi-sik Kim ),정하나 ( Ha-na Jeong ),공경희 ( Kyoung-hui Kong ),김아라 ( Ah-ra Kim ),전영호 ( Young-ho Jeon ),오명주 ( Myung-joo Oh ) 한국어류학회 2016 韓國魚類學會誌 Vol.28 No.3

본 연구에서는 넙치 유래 VHSV (genotype IVa)에 의한 무지개송어의 영향을 조사하기 위하여 다양한 조건에서 감염 실험을 실시하였다. 3개의 다른 로트의 담수 무지개송어 치어에 VHSV (10^6.3-7.3 TCID₅₀/fish)를 복강 주사한 결과, 15% 이하의 누적 폐사율이 관찰되었다. 무지개송어 (in vivo)를 사용하여 VHSV를 계대 배양한 후 감염 실험을 실시한 결과, VHSV를 5회 계대 배양하여도 독력의 변화는 관찰되지 않았다. 해수에 사육 중인 송어 (성어)에 넙치 유래 VHSV(10^5.3 TCID₅₀/fish와 10^6.3 TCID₅₀/fish)를 복강 주사한 결과, 폐사어는 관찰되지 않았고, 어체 내에서도 VHSV는 검출되지 않았다. 이상의 결과, 해수 송어 (성어)에서는 넙치 유래 VHSV의 병원성이 확인되지 않았으나 담수 무지개송어 치어에서는 낮은 독력을 나타내었다. Experimental infection of rainbow trout Oncorhynchus mykiss with viral hemorrhagic septicemia virus (VHSV, genotype IVa) from olive flounder Paralichtys olivaceus was examined. The cumulative mortalities of three different lot of rainbow trout fry challenged with VHSV (10^6.3-7.3 TCID₅₀/ fish) were less than 15%. No difference of virulence was observed in experimental infection using 5 in vivo passaged VHSV and original VHSV. No mortality was observed in seawater-reared rainbow trout (adult) challenged with VHSV (10^5.3-6.3 TCID₅₀/fish) and virus was not detected in the fish. We thus concluded that VHSV from olive flounder has low virulence to rainbow trout fry, but not pathogenic to seawater-rainbow trout (adult).

단기간의 전지훈련 운동프로그램과 작약 감초 음료 섭취에 따른 남녀 농구선수들의 피로물질에 미치는 영향

하창호(Ha, Chang-Ho),전용균(Jeon, Yong-Kyun),소위영(So, Wi-Young) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3

The purpose of this study was to examine the effects of intake of peony-licorice mixture drink on the fatigue (as evaluated by blood examination) caused by plyometric training exercise in male and female professional basketball players. Subjects consisted of male (n = 11) and female (n = 9) professional Korean basketball players. All players underwent 180 min/day (first session, 90min in the morning; second session, 90min in the evening) of plyometric training, which was performed for 6 d/wk over a period of 2 weeks with intake of peony-licorice mixture drink. Each exercise session was composed of 3 phases: warm-up for 20 min, main plyometric training for 60 min, and cool-down for 10 min. Two-way repeated analysis of variance (ANOVA) was used for statistical analysis. Interaction effects (time×group) were not observed with glucose levels for both male and female players(p>0.05). However, interaction effects(time×group) were observed with lactate levels in both male(p=0.014) and female (p=0.047) groups. It was concluded that plyometric training and intake of peony-licorice mixture drink are positive training methods and ergogenic aids, respectively, for decreasing fatigue in professional basketball players.

Health effects of exposure to radon: implications of the radon bed mattress incident in Korea

서송원,Wi-Ho Ha,강진규,이달님,박수진,권태은,진영우 한국역학회 2019 Epidemiology and Health Vol.41 No.-

Radon is a naturally occurring radioactive material formed by the slow decay of uranium and thorium found in the earth’s crust or construction materials. Internal exposure to radon accounts for about half of the natural background radiation dose to which humans are exposed annually. Radon is a carcinogen and is the second leading cause of lung cancer following smoking. An association between radon and lung cancer has been consistently reported in epidemiological studies on mine workers and the general population with indoor radon exposure. However, associations have not been clearly established between radon and other diseases, such as leukemia and thyroid cancer. Radiation doses are assessed by applying specific dose conversion coefficients according to the source (e.g., radon or thoron) and form of exposure (e.g., internal or external). However, regardless of the source or form of exposure, the effects of a given estimated dose on human health are identical, assuming that individuals have the same sensitivity to radiation. Recently, radiation exceeding the annual dose limit of the general population (1 mSv/yr) was detected in bed mattresses produced by D company due to the use of a monazite-based anion powder containing uranium and thorium. This has sparked concerns about the health hazards for mattress users caused by radiation exposure. In light of this event, this study presents scientific information about the assessment of radon and thoron exposure and its human implications for human health, which have emerged as a recent topic of interest and debate in society.

12주간의 복합운동이 여자 대학생의 신체조성과 대사증후군 위험인자에 미치는 영향

하창호(Ha, Chang-Ho),소위영(So, Wi-Young) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3

Metabolic syndrome (MS) is associated with serious health issues worldwide. The purpose of this study was to examine the effect of 12 weeks of combined exercise training on body composition and metabolic syndrome factors in Korean female college students. Subjects were randomly assigned to the exercise (n=10) and control (n=10) groups. The exercise group trained for 80 minutes/day for 3 days/week during the 12 weeks. Each exercise session comprised 3 phases: warm up for 10 minutes, main exercise for 60 minutes (aerobic exercise, 30 minutes; resistance exercise, 30 minutes), and cool down for 10 minutes. The exercise intensity for aerobic exercise was maintained at 60 - 80% of the heart rate reserve for 30 minutes; and that for resistance exercise was 10 - 15 repetitions maximum for 30 minutes. Two-way repeated analysis of variance was used for statistical analysis. Interaction effects (time × group) were not observed for body composition factors such as weight, body mass index, and body fat (%) and MS-related factors such as waist circumference; systolic blood pressure; diastolic blood pressure; and levels of triglycerides, glucose, total cholesterol, and low-density lipoprotein (p>.05). However, interaction effects (time × group) were observed for muscle mass (p=.032) and high-density lipoprotein levels (p=.006). Thus, we concluded that a 12-week supervised combined exercise program could not effectively improve body composition and MS-related factors in Korean female college students.