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http://dx.doi.org/10.7742/jksr.2018.12.1.31

Analysis of Counting Rate according to Presence or Absence of Detector's Protector in Beta-rays Measurement using Geiger-Muller Counter  

Jang, Ji-Yong (Orbitech Co,.Ltd.)
Jeong, Moon-Taeg (Department of Radiological Science, Dongshin University)
Song, Jong-Nam (Department of Radiological Science, Dongshin University)
Ha, Jae-Jun (Envirokorea Co,.Ltd.)
Han, Jae-Bok (Department of Radiological Science, Dongshin University)
Publication Information
Journal of the Korean Society of Radiology / v.12, no.1, 2018 , pp. 31-37 More about this Journal
Abstract
In the surface contamination test using the end-window Geiger-Muller type counter, the wrap is used as a method for protecting the detector exposed to the outside in order to measure the beta-rays. We analyze the effect of this method on the measurement rate and the correction factor, and wanted to make it clear to radiation workers that excessive use of the wrap can affect the measured value of the beta-rays. The experimental method was to compare and analyze the change of the beta-rays measurement counting rate and the calibration factor according to the wrap thickness using the beta-rays with different energy of 3 KBq, 1.5 KBq and 0.3 KBq. The subjects of this study were the end-window Geiger-Muller type counter which were held at the calibration center certified by Korea Laboratory Accreditation Scheme (KOLAS) in March 2012, Cl-36 (Chlorine) and Sr-90 (Strontium) were used as the source of beta radiation. The measurement counting rate decreased with increasing wrap thickness, and the calibration factor increased with increasing wrap thickness. Since the changes of the measurement counting rate and the calibration factors can reduce the accuracy of the instrument readings, but also have a significant impact on detector contamination and damage, so there is a need to find out what thickness of wrap is most effective. If we using a wraps with thickness that show a low rate of change of the measurement counting rate and the calibration factor, it will protect the detector and minimize the effect on the measured value of the beta-rays.
Keywords
Geiger-Muller counter; Surface contamination; Beta-rays; Wrap;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Nuclear Training & Education Center, Radiation obstruction and protection, Korea Atomic Energy Research Institute, pp. 131-135, 2009.
2 S.S. Kang, RISRI Summary Book, NUCLEARACADEMY, pp. 70-74, 2010.
3 H.G. Kim, Radiation Theory and Practice, Korean Association for Radiation Application, pp. 52-55, 2012.
4 Y.J. Lee, G.B. Seong, "Comparison of calibration factors of beta survey meter (surface contamination monitor) according to beta source," Korean Association For Radiation Protection, pp. 136-137, 2009.
5 K.M. Lee, "Construction and dose delivery characterization of an alpha-particle irradiator for research of internal exposure," Diss. The Graduate School Seoul National University, 2015.
6 J.G. Lee, Principles of radiation protection, Korean Association for Radiation Application, pp. 8-11, 2016.
7 H.G. Kim, T.Y. Kong, K.R. Dong, E.J. Choi. "A Review of Radiation Field Characteristics and Field Tests for Estimating on the Extremity Dose under Contact Tasks with Radioactive Materials," The journal of the korean society of radiation industry, Vol. 11, No. 3, pp. 123-130, 2017.
8 I.S. Lim, K.Y Kim, G.H. Roh, "A New Model to Calculate an Absorbed Dose for the Gamma Irradiation Facility," The Journal of the Korean Society of Radiation Industry, Vol. 3, No. 2, pp. 115-120, 2009.
9 K. T. Kim, J. H. Kim, M. J. Han, Y.J. Heo, K.J. Ahn, S.K. Park, "The Study on Design of Semiconductor Detector for Checking the Position of a Radioactive Source in an NDT," The Journal of the Korean Society of Radiology, Vol. 11, No. 3, pp. 171-175, 2017.   DOI