EFFECTS OF INCOHERENT AND COHERENT SCATTERING ON THE EXPOSURE BUILDUP FACTORS OF LOW-ENERGY GAMMA-RAYS

被引：26

作者：

HIRAYAMA, H ^{[1
]}

TRUBEY, DK ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,CTR RADIAT SHIELDING INFORMAT,OAK RIDGE,TN 37831

来源：

NUCLEAR SCIENCE AND ENGINEERING | 1988年 / 99卷 / 02期

关键词：

PHOTONS - Transport Properties;

D O I：

10.13182/NSE88-A23555

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：

The effects of including incoherent and coherent scattering in a calculation of the exposure buildup factors for plane normal gamma-ray sources have been investigated by using an electron-gamma-ray shower Monte Carlo code, EGS4, for water, iron, and lead in the 40- to 200-keV range. The 'true' buildup factors and 'pseudo' buildup factors for practical uses are defined to clarify the effects of bound-electron Compton (incoherent) and coherent scattering and are tabulated for penetration depths up to 10 mfp. The pseudo buildup factor increases by including incoherent scattering and decreases by including coherent scattering. The degree of each effect varies with the atomic number of the material. The effect of incoherent scattering is large for materials of small atomic number, and the effect of coherent scattering is large for materials of large atomic number.

引用

页码：145 / 156

页数：12

共 9 条

[1]

[Anonymous], [No title captured]

[2]

GOLDSTEIN H, 1954, NYO3075 NUCL DEV ASS

[3] EXPOSURE BUILDUP FACTORS OF HIGH-ENERGY GAMMA-RAYS FOR WATER, CONCRETE, IRON, AND LEAD [J].

HIRAYAMA, H .

NUCLEAR TECHNOLOGY, 1987, 77 (01) :60-67

[4]

Hubbell J.H, 1969, NSRDSNBS29

[5] COHERENT SCATTER IN DIAGNOSTIC-RADIOLOGY [J].

JOHNS, PC ;

YAFFE, MJ .

MEDICAL PHYSICS, 1983, 10 (01) :40-50

[6]

Storm E., 1970, ATOM DATA NUCL DATA, V7, P565, DOI DOI 10.1016/S0092-640X(70)80017-1

[7] EFFECT OF FLUORESCENCE, BREMSSTRAHLUNG, AND ANNIHILATION RADIATION ON THE SPECTRA AND ENERGY DEPOSITION OF GAMMA-RAYS IN BULK MEDIA [J].

SUBBAIAH, KV ;

NATARAJAN, A ;

GOPINATH, DV ;

TRUBEY, DK .

NUCLEAR SCIENCE AND ENGINEERING, 1982, 81 (02) :172-195

[8] BUILDUP FACTORS OF GAMMA-RAYS INCLUDING BREMSSTRAHLUNG AND ANNIHILATION RADIATION FOR WATER, CONCRETE, IRON, AND LEAD [J].

TAKEUCHI, K ;

TANAKA, S .

NUCLEAR SCIENCE AND ENGINEERING, 1984, 87 (04) :478-489

[9] DETAILED INVESTIGATION OF THE BUILDUP FACTORS AND SPECTRA FOR POINT ISOTROPIC GAMMA-RAY SOURCES IN THE VICINITY OF THE KEDGE IN LEAD [J].

TANAKA, SI ;

TAKEUCHI, K .

NUCLEAR SCIENCE AND ENGINEERING, 1986, 93 (04) :376-385

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