Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2009  |  Volume : 34  |  Issue : 3  |  Page : 176-179

Effective atomic numbers and electron density of dosimetric material


1 Department of Physics, Gulbarga University, Gulbarga - 585 106, India
2 Radiation Safety and System Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India

Correspondence Address:
B R Kerur
Department of Physics, Gulbarga University, Gulbarga - 585 106
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.54853

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A novel method for determination of mass attenuation coefficient of x-rays employing NaI (Tl) detector system and radioactive sources is described.in this paper. A rigid geometry arrangement and gating of the spectrometer at FWHM position and selection of absorber foils are all done following detailed investigation, to minimize the effect of small angle scattering and multiple scattering on the mass attenuation coefficient, m/r, value. Firstly, for standardization purposes the mass attenuation coefficients of elemental foils such as Aluminum, Copper, Molybdenum, Tantalum and Lead are measured and then, this method is utilized for dosimetric interested material (sulfates). The experimental mass attenuation coefficient values are compared with the theoretical values to find good agreement between the theory and experiment within one to two per cent. The effective atomic numbers of the biological substitute material are calculated by sum rule and from the graph. The electron density of dosimetric material is calculated using the effective atomic number. The study has discussed in detail the attenuation coefficient, effective atomic number and electron density of dosimetric material/biological substitutes.


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