# 방사선 측정관련 보정인자 계산

• Published : 2003.03.30

#### Abstract

The self-attenuation factor for an $^{198}Au$ sample and the 0.412 MeV gamma-ray penetration ratio in the circular Al-cover of the radiation detector have been determined using an analytical solution and MCNP code. The results show that the self-attenuation factors obtained from the analytical solution coincide with those of MCNP code for all but the Au sample with the relatively larger radius. Then the maximum difference between the two methods appears to be 9 % in the Au sample of 1.5 mm radius. It also is revealed that the analytical solutions of the 0.412 MeV gamma-ray penetration ratio in the Al-cover of 7.62 cm radius are consistent with those of the MCNP code within the standard deviation.

#### References

1. R. D. Evans and R. O. Evans, ‘Stuties of self-absorption in gamma-ray sources,’ Rev. Mod Phys. 20(1), 305-326 (1948)
2. W. R. Dixon, ‘Self-absorption corrections for large gamma-ray sources,’ Nucleonics 8(4), 68-72 (1951)
3. Briesmeister, J. F., MCNP-4B Monte Carlo N-Particle Transport Code System, CCC-200 (1993)
4. Jack L. Parker, 'Attenuation correction procedures', in Passive Nondestructive Assay of Nuclear Materials, Doug Reilly, Norbert Ensslin and Hastings Smith, Jr., eds., pp. 159-194, USNRC, LA-UR-90-732 (1991).
5. X-ray Mass Attenuation Coefficients, http://physics. nist.gov/hysRefData/XrayMassCoeflElemTab/z79,13.html accessed on 2 Feb. 2002
6. Atomic weight and density, http://dental.senzoku.showa-u.ac.jp/dent/radiol/Pro.../Atomicweight.html accessed on 25 Feb. 2002
7. J. P. Francois, ‘On the calculation of the self-absorption in spherical radioactive sources,’ Nucl. Instr. and Meth 117, 153-156 (1974)
8. M. Abramowitz and I. A. Stegum (ed.), Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, pp. 887-888, Dover Pub. Inc., New York(1965)
9. 홍권표， 신희성， 이상윤 및 노성기, '0.412 MeV 감마선에 대한 원주형 NaI(Tl) 섬광체의 총 절대검출효율계산,'대한방사선방어학회지 27(4), 199-205 (2002)
10. William J. Price, Nuclear Radiation Detection, 2nd. ed., p.130, McGraw-Hill Book Co., New York (William J. Price, Nuclear Radiation Detection, 2nd. ed., p.130, McGraw-Hill Book Co., New York (1964)