Environ Health Perspect 105, Suppl. 6, Dec. 1997: Article by Kim et al.

Environmental Health Perspectives 105, Supplement 6, December 1997

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Establishment of ANSI N13.11 X-ray Radiation Fields for Personal Dosimetry Performance Test by Computation and Experiment

Jang-Lyul Kim,¹ Bong-Hwan Kim,¹ Si-Young Chang,¹ and Jai-ki Lee²

¹Health Physics Department, Korea Atomic Energy Research Institute, Taejon, Korea; ²Nuclear Engineering Department, Han-Yang University, Seoul, Korea

Abstract
This paper describes establishment by computational and experimental methods of the American National Standard Institute (ANSI) N13.11 X-ray radiation fields by the Korea Atomic Energy Research Institute (KAERI). These fields were used in the standard irradiations of various personal dosimeters for the personal dosimetry performance test program performed by the Ministry of Science and Technology of Korea in the autumn of 1995. Theoretical X-ray spectra produced from two KAERI X-ray generators were estimated using a modified Kramers' theory with target attenuation and backscatter correction and their spectral distributions experimentally measured by a high-purity germanium semiconductor detector through proper corrections for measured pulse height distributions with photopeak efficiency, Compton fraction, and K-escape fraction. The average energies and conversion coefficients obtained from the computation and experimental methods, when compared with ANSI N13.11 and the recently published National Institute of Standards and Technology X-ray beams, appeared to be in good agreement--±3% between corresponding values--and thus, could be satisfactorily applied in the performance test of personal dosimeters. -- Environ Health Perspect 105(Suppl 6):1417-1421 (1997)

Key words: personal dosimetry, ANSI X-ray, spectrum calculation, spectrum measurement, average energy, conversion coefficients

This paper is based on a presentation at the International Conference on Radiation and Health held 3-7 November 1996 in Beer Sheva, Israel. Abstracts of these papers were previously published in Public Health Reviews 24(3-4):205-431 (1996). Manuscript received at EHP 28 February 1997; accepted 5 June 1997.
Address correspondence to Dr. J-L. Kim, Health Physics Department, Korea Atomic Energy Research Institute, P.O. Box 105, Taejon, Korea. Telephone: 82 42 868 8367. Fax: 82 42 868 8609. E-mail: jlkim@nanum.kaeri.re.kr
Abbreviations used: ANSI, American National Standard Institute; CSDA, continuous slowing down range approximation; HPGe, high-purity germanium; ICRU, International Commission on Radiation Units and Measurements; ISO, International Organization for Standardization; PMMA, polymethylmetacrylate; T-W, Thomson-Whiddington.

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