• Title/Summary/Keyword: Surveymeter

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Study in Occupational Exposure to Radiations and Radioactive Isotopes (방사선 및 방사성동위원소 근로자 피폭실태 연구)

  • Lee, Du-Yong;Kim, Kwang-Jin;Park, Hee-Chan
    • The Journal of the Korea Contents Association
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    • v.9 no.6
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    • pp.247-255
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    • 2009
  • This study aims to provide basic data for establishing the safety and health plan by investigating the exposure conditions in the facilities registering business about handling radiations and radioactive isotopes in Korea. dose levels(working space, worker location) of the workers in 153 facilities were measured using surveymeter, and individual exposure concentration[(shallow dose(SD), depth dose(DD)] in 27 facilities using thermal luminescence dosimeter(TLD). In accordance with the measurement results by business type[fire fighting prevention business(FFPB, n=10), financial insurance business(FIB, n=3) and other facilities(n=140)] using surveymeter, those three business type groups showed difference (p<0.000). Dose levels of worker location for FFPB and FIB were significantly higher than 10.0 ${\mu}Sv$/hr, the allowable standard for radiations and radioactive isotopes, and they were higher 109.3 times(p<0.000) and 187.5 times(p<0.000) than those in other facilities. The concentration of TLD[FFPB(n=10), other facility (n=17)] in DD of FFPB was significantly higher than that in other facility(p=0.05). In accordance with the analysis result on relationship between surveymeter and TLD, the dose on working space and worker location(r=0.406, p<0.05), worker location dose and SD(r=0.453, p<0.05), worker location dose and DD(r=0.553, p<0.01), and SD and DD(r=0.927, p<0.001) had all related each other. It is urgently required to change FFPB and FIB from the facilities requiring registration for handling radiations and radioactive isotopes to the facilities that shall get permission for handling radiations and radioactive isotopes by reestablishing the legal administration area, for safety and health of radiation occupants.

Development and Testing of CdZnTe Detector for Pocket Surveymeter (CdZnTe 검출기를 이용한 개인용 Pocket Surveymeter의 제작 및 특성)

  • Lee, Hong-Kyu;Kang, Young-Il;Choi, Myung-Jin;Wang, Jin-Suk;Kim, Byung-Taik
    • Journal of Radiation Protection and Research
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    • v.21 no.1
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    • pp.1-7
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    • 1996
  • In this paper, we discussed the fabrication and characterization of bulk type CdZnTe detector for pocket surveymeter. The resistivity of CdZnTe single crystal grown by the High Pressure Bridgman method is in the mid of $10^9$ ohm-cm. The detector structure is Au/CdZnTe/Au and gold electrode is formed by electroless deposition method. Resolutions of 4.8keV and 2.2keV were observed at 22.2keV line of $^{109}Cd$ and 59.6keV line of $^{241}Am$ at room temperature, respectively. We also constructed the small size pocket surveymeter using home made CdZnTe detector. It shows the good linearity over a range from 1mR/hr to 10R/hr with deviation less than 5%. The sensitivity of the surveymeter developed is $2.2{\times}10^3 cps/Rad\;hr^{-1}$ for the 662keV of $^{l37}Cs\;{\gamma}-ray$.

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Development and Application of the Semiconductor Neutron Radiation Detector (반도체 중성자 탐지소자 개발 및 응용)

  • Lee, Nam-Ho;Lee, Hong-Kyu;Youk, Young-Ho
    • Journal of the Korea Institute of Military Science and Technology
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    • v.14 no.2
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    • pp.299-304
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    • 2011
  • In this paper, we developed the semiconductor neutron radiation detector and the multi-purpose radiation detection technologies for the next generation military personal surveymeter. The PIN type semiconductor neutron detector and the prototype measure the neutron radiation dose upto 1,000cGy with ${\pm}20%$ error. It also have a good performance about the Gamma, Alpha and Beta radiation and MIL-STD-810F.

Usefulness of wearing pocket dosimeter in nuclear medicine (핵의학 영상검사에서 Pocket dosimeter 착용의 유용성 평가)

  • Kim, Young-Bin;Lee, Eun-Ji;Kim, Kun-Jae
    • The Korean Journal of Nuclear Medicine Technology
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    • v.15 no.1
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    • pp.25-28
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    • 2011
  • Purpose: The aim of study is to find accuracy of pocket dosimeter in measuring exposed dose in compared with survey meter and to compare exposed dose according as Nuclear medicine exams. Materials and Method: First, radiation dose to point source(185 MBq,370 MBq, ${\ldots}$, 1665 MBq, 1850 MBq) were measured in using a pocket dosimeter and a survey meter. Second, radiation dose to 12 patients injected $^{18}F$-FDG 370 MBq were measured in using a pocket dosimeter and a survey meter. Third, radiation dose to 10 patients injected $^{99m}Tc$-DPD 925 MBq were measured in using a pocket dosimeter and a surveymeter. Result: The average is $70.12{\pm}39.36{\mu}Sv/h$ in measurement of point source with Surveymeter and $5{\pm}3.06{\mu}Sv$ in measurement of point source with Pocket dosimeter. The average is $25.04{\pm}6.16{\mu}Sv/h$ in measurement of PET/CT patients with Surveymeter and $2.41{\pm}0.51{\mu}Sv$ in measurement of PET/CT with Pocket dosimeter. The average is $8.58{\pm}0.96{\mu}Sv/h$ in measurement of Bone Scan patients with Surveymeter and $1{\mu}Sv$ in measurement of Bone Scan patients with Pocket dosimeter. Significant difference found between Survey meter value and Pocket dosimeter value in all experimentation (p<0.001). Conclusion: Accoring to rusult Wearing Pocket dosimeter is usefulnee in manerage of exposed dose in nucler medicine exams.

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Measurement of the Spatial Dose Rates from Radioactive Patients during Nuclear Medicine Studies (핵의학 검사에서 환자로부터의 공간선량률 측정)

  • Park, Myeong-Hwan;Lee, Jon-Il
    • Journal of radiological science and technology
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    • v.25 no.1
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    • pp.73-76
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    • 2002
  • In order to evaluate the exposure to the radiologic technologists from patients who had been administrated with radiopharmaceuticals, we measured the spatial dose rates at 5 cm, 50 cm, and 100 cm from skin surface of patients using an proportional digital surveymeter, both 5 min after injection and right before the studies. In results, the exposure to the technologists in each procedure was small, compared nth the dose limits of the medical workers. However, the dose-response relationships in cancer and hereditary effects, referred to as the stochastic effects, have been assumed linear and no threshold models ; therefore, the exposure should be minimized. For this purpose, the measurements of spatial dose rate distributions were thought to be useful.

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포항방사광가속기 저장링시운전시의 방사선측정

  • 이희석;김제한;홍석모;박응수;정진화
    • Proceedings of the Korean Nuclear Society Conference
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    • 1995.05b
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    • pp.899-905
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    • 1995
  • 포항방사광가속기(Pohang Llght Sousrc)의 시운전기간동안 저장링건물에서의 방사선발생량을 측정하였다. Ionization Chamber와 Moderated BF$_3$ Counter로 구성된 지역방사선감시기시스템(RMS)외에 Pocket Inonization chamber, 연속기록이 가능한 Surveymeter를 고정 또는 이동시키면서 사용하였다. 시운전기간동안 선형가속기로부터의 입사시기와 저장시기에서의 방사선방출분포 및 선량의 정도가 명확히 구별되었으며 RF Cavity나 Bump Magnet등의 오동작에 의한 방사선 발생경로를 추정해 볼 수 있었다 여기서는 저장링실험지역 등에서의 공간선량분포와 부분차폐에 따른 변화를 측정하였으며 측정결과로부터 차폐계산시 사용된 방법을 통해 역으로 각 지역의 빔손실정도를 추정하고 계산식의 타당성을 검토해 보았다.

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Evaluation for Performance of a Military Radiation Detecter PDR-1K : Focused on Dependence of Angular and Energy (군사용 방사선 계측기 PDR-1K 반응도 평가 : 방향 및 에너지 의존성을 중심으로)

  • Park, Wonseok;Choi, Junhyuk;Jung, Doyoung;Kim, Jango;Min, Byungin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.2
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    • pp.300-305
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    • 2017
  • In this paper, we performed a evaluation for angular and energy dependence of military radiation detector PDR-1K. Its measuring range is divided into two section, low and high, and each range has a GM tube separately owing to broad scale. We observed a change in relative angular reactivity within 0.928 ~ 1.188 in low range and within 0.743 ~ 1.000 in high range from $-90^{\circ}$ to $+90^{\circ}$. The evaluation for energy dependence appeared a relative reactivity within 0.892 ~ 1.000 above 83 keV. This means PDR-1K isn't possible to use below 83 keV of radiation energy. It is possible to provide response information to user and to increase reliability of radiation measurement through this paper.

Measurement of the Spatial Dose Rates During PET/CT Studies (전신 PET/CT 검사에서 공간선량률 측정)

  • Park, Myeong-Hwan
    • Journal of radiological science and technology
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    • v.29 no.4
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    • pp.257-260
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    • 2006
  • In order to evaluate the exposure to the radiologic technologists from patients who had been administrated with radiopharmaceuticals, we measured the spatial dose rates at $5{\sim}300\;cm$ from skin surface of patients using an proportional digital surveymeter, 1.5(PET scan) and 4hr(bone scan) after injection. In results, the exposure to the technologists in each procedure was small, compared with the dose limits of the medical workers. However, the dose-response relationships in cancer and hereditary effects, referred to as the stochastic effects, have been assumed linear and no threshold models ; therefore, the exposure should be minimized. For this purpose, the measurements of spatial dose rate distributions were thought to be useful.

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Report of Present Status of Calibration for Domestic Radiation Measurements Instruments (국내 방사선 측정장비 보유 현황 및 교정 현황 조사)

  • Lim, Sangwook;Choi, Jinho;An, Sohyun;Cho, Kwang Hwan;Lee, Sang Hoon;Lee, Rena;Cho, Sam Ju
    • Progress in Medical Physics
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    • v.27 no.1
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    • pp.46-53
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    • 2016
  • Periodical calibrations of radiation detectors are important for accurate quality assurance of therapeutic linac. The measuring instruments such as ion-chamber, thermometer, barometer, and survey meter should be calibrated periodically. Period of calibration for these instruments is suggested 6 month to one year in Korea and two years in other countries nowadays. Therefore, the determination of reasonable period for calibration is needed. In this study, we plan to utilize the results of these survey; frequent in use, how to use and stability of instruments, to determine the optimized period of calibration for the instruments in the departments of radiation oncology in Korea based on the ILAC-G24. The SurveyMonkey web-based survey tool was used and the objects of survey were 18 department of radiation oncology in university hospitals, and 15 departments were answered. The 64 questionnaires which supposed to be answered in 50 minutes were classified as the information of candidates, the thermometer, the barometer, the surveymeter, and the ion-chamber. The thermometers and the barometers were not under periodical calibration for more than half of candidates. The periods of calibration of surveymeters were 6 month to 1 year. We expect that the calibration period can be determined based on these survey results.