Calculation of photon scattering and transmission correction factors for a free air ionization chamber at Nuclear Science and Technology Research Institute in Iran

被引：1

作者：

Kashian, S. ^{[2
]}

Eskandari, M. R. ^{[1
]}

Raisali, G. ^{[2
]}

Khalafi, H. ^{[2
]}

机构：

[1] Azad Univ, Dept Phys, Shiraz Branch, Tehran, Iran

[2] Nucl Sci & Technol Res Inst, Radiat Applicat Res Sch, Tehran, Iran

来源：

ANNALS OF NUCLEAR ENERGY | 2012年 / 42卷

关键词：

Air kerma strength; Low energy brachytherapy sources; Photon scattering; Photon transmission; Correction factor; X-RAYS; KERMA; CALIBRATION; STANDARDS;

D O I：

10.1016/j.anucene.2011.12.009

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

In primary standard dosimetry laboratories, the air kerma strength of low energy brachytherapy sources I-125 and Pd-103 is measured by standard free air ionization chambers. At present, one of these free air ionization chambers is constructed in Radiation Application Research School, in Nuclear Science and Technology Research Institute in Iran. The transmission and scattering correction factors are needed for the absolute determination of air kerma strength. Transmission and scattering correction factors were calculated for a monoenergetic point isotropic source with energies from 5 key to 100 key for ionization chamber with 4 cm and 6 cm aperture radii by using the MCNP 4C code. The calculated scattering correction factors for I-125 and Pd-103 brachytherapy sources are 0.9987 and 0.9992, respectively and determined transmission correction is one for our free air ionization chamber of aperture radius 4 cm. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：158 / 160

页数：3

共 19 条

[1] Dosimetric study of a new polymer encapsulated palladium-103 seed [J].

Bernard, S ;

Vynckier, S .

PHYSICS IN MEDICINE AND BIOLOGY, 2005, 50 (07) :1493-1504

[2]

Briesmeister J.F., 2000, MCNP-A general Monte Carlo N -particle transport code, version 4A, V2

[3] Free-air ionization chambers [J].

Burns, D. T. ;

Bueermann, L. B. .

METROLOGIA, 2009, 46 (02) :S9-S23

[4] Diaphragm correction factors for free-air chamber standards for air kerma in x-rays [J].

Burns, D. T. ;

Kessler, C. .

PHYSICS IN MEDICINE AND BIOLOGY, 2009, 54 (09) :2737-2745

[5] Large-volume ionization chamber with variable apertures for air-kerma measurements of low-energy radiation sources [J].

Culberson, WS ;

DeWerd, LA ;

Anderson, DR ;

Micka, JA .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2006, 77 (01) :1-9

[6] The role of active treatment in early prostate cancer [J].

Denis, LJ .

RADIOTHERAPY AND ONCOLOGY, 2000, 57 (03) :251-258

[7] Correction factors for the NMi free-air ionization chamber for medium-energy x-rays calculated with the Monte Carlo method [J].

Grimbergen, TWM ;

van Dijk, E ;

de Vries, W .

PHYSICS IN MEDICINE AND BIOLOGY, 1998, 43 (11) :3207-3224

[8]

Kurosawa T., 2005, CCRI10527 BUR INT PO

[9] The performance of the INER improved free-air ionization chamber in the comparison of air kerma calibration coefficients for medium-energy X-rays [J].

Lee, JH ;

Kotler, LH ;

Büermann, L ;

Hwang, WS ;

Chiu, JH ;

Wang, CF .

RADIATION MEASUREMENTS, 2005, 39 (01) :1-10

[10]

Lin U.T., 2005, KEK P, V3, P245

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