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IJPAP Vol.42 [2004] >
IJPAP Vol.42(09) [September 2004] >


Title: Numerical evaluation of lead equivalence of patient and hardware materials in medical diagnostic X-ray shielding
Authors: Okunade, Akintunde Akangbe
Keywords: Attenuation properties
Hardening properties
Primary radiation level
Attenuation equivalent thicknesses
Hardening equivalent thicknesses
Issue Date: Sep-2004
Publisher: CSIR
IPC CodeG 01 L 1/25
Abstract:  Numerical comparison of attenuation and hardening properties of phantom (lucite, soft tissue, water) and hardware (aluminium and steel) materials with those of lead has been carried out. Results show that the shieldings that are affordable by lead attenuation equivalent thicknesses (LAE) and lead hardening equivalent thicknesses (LHE) are not strictly equivalent to those affordable by thickness of substitutes (phantom materials, aluminium and steel) when there are differences in attenuation and hardening properties. Even though beams through LAE that are not ‘exact’ have equal exposure values, the half value layers are higher than those through thickness of lead substitutes. Example calculations show that the use of lead thickness (LAE) that are not ‘exact’ to account for the shielding afforded by the thickness of patient (water phantom) produce lesser reduction of primary radiation level in the area marked for shielding. The ‘exact’ LAE that will reduce primary radiation level equally as the patient and radiographic table may be higher by close to 20 % or more of that which is not ‘exact’.
Page(s): 629-647
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(09) [September 2004]

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