[논문]A LONG-TERM FIELD TEST OF A LARGE VOLUME IONIZATION CHAMBER BASED AREA RADIATION MONITORING SYSTEM DEVELOPED AT KAERI

Kim, Han-Soo; Ha, Jang-Ho; Park, Se-Hwan; Kim, Jung-Bok; Kim, Young-Kyun; Jin, Hyung-Ho

A LONG-TERM FIELD TEST OF A LARGE VOLUME IONIZATION CHAMBER BASED AREA RADIATION MONITORING SYSTEM DEVELOPED AT KAERI 원문보기

방사선방어학회지 = Radiation protection : the journal of the Korean association for radiation protection, v.34 no.2, 2009년, pp.77 - 81

Kim, Han-Soo (Korea Atomic Energy Research Institute) , Ha, Jang-Ho (Korea Atomic Energy Research Institute) , Park, Se-Hwan (Korea Atomic Energy Research Institute) , Kim, Jung-Bok (Korea Atomic Energy Research Institute) , Kim, Young-Kyun (Department of Nuclear Engineering, Hanyang University) , Jin, Hyung-Ho (Korea Hydro & Nuclear Power Co., Ltd, Young-gwang Nuclear Power site)

Abstract ▼ AI-Helper

An Area Radiation Monitoring System (ARMS) ionization chamber, which had an 11.8 L active volume, was fabricated and performance-tested at KAERI. Low leakage currents, linearities at low and high dose rates were achieved from performance tests. The correlation coefficients between the ionization currents and the dose rates are 1 at high dose rate and 0.99 at low dose rate. In this study, an integration-type ARMS ionization chamber was tested over a year for an evaluation of its long-term stability at a radioisotope (RI) repository of the Young-gwang nuclear power plant. The standard deviation of dose rate of 1 day data and over a 100-days mean value were 6.2 $\mu$R/h and 2.9 $\mu$R/h, respectively. The fabricated ARMS ionization chamber showed stable performance from the results of the long-term tests. Design and performance characteristics of the fabricated ionization chamber for the ARMS from performance-tests are also addressed.

주제어

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문제 정의

This study is to address the laboratory tests and the long-term stability test of the ARMS with a large volume ionization chamber manufactured at KAERI.

제안 방법

An ARMS ionization chamber with integrated electronics was fabricated at KAERI. A low leakage current, a flatness of the plateau region in the saturation curve, and a linearity both at high and low dose rates were achieved from the performance tests. Long-term stability was also evaluated over a one year period in the RI reservoir room at the Young-gwang nuclear power plant.

대상 데이터

4. The source was placed in a low mass holder at a height of about 1 m above the floor and at a distance of 4, 5, 6 m from the ionization chambers, which were at the same height on a low mass stand. A 30-cm thick lead shield with a cross section measuring 10 × 10 cm² was interposed on a low mass stand so as to intercept all the primary rays from the source to all parts of the ionization chambers through a full thickness of the shield.

이론/모형

The bias current reaches at a point where the no more ions can be collected and saturated. The saturated voltage was measured with a 25 mCi ²⁴¹Am gamma source at a 10 mm distance from the center of the ionization chamber using an experimental two-voltage method [4-6]. The saturated voltage can be determined from the calculation of the collection efficiency of the ionization chamber.

참고문헌 (10)

Knoll GF. Radiation detection and measurement. 3th ed. New York; John Wiley and Sons, 1999:129-157
Kenneth RK. The dosimetry of ionizing radiation. Vol.2, New York; Academic press, 1987: 169-243
Burlin TE. A general theory of cavity ionization. Br. J. Radiol. 1966;39:727-734

상세보기
Bohm J. Saturation corrections for plane-parallel ionization chambers. Phys. Med. Biol. 1976;21:754-761

상세보기
Scott PB, Greening JR. The determination of saturation currents in free-air ionization chambers by extrapolation method. Phys. Med. Biol. 1963;8:51-59

상세보기
Weinhous MS, Meli A. Determining P $_{ion}$ , the correction factor for recombination losses in an ionization chamber. Med. Phys. 1984;11:849-856

상세보기
Piermattei A, Azario L, Arcovito G, Toni M. Ionrecombination correction factor ${k}^{sat}$ for spherical ion chambers irradiated by continuous photon beams. Phys. Med. Biol. 1996;41:1025-1035

상세보기
IAEA, Technical Report Series No. 277. 1987
Keithley Model 6517A. Electrometer user's manual, http://www.keithley.com
Decampo JA, Beck HL, Raft PD. High pressure argon ionization chamber systems for the measurement of environmental radiation exposure rates. New York, U. S. Atomic Energy Commission, 1972:1-69

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