Gamma Ray Attenuation Properties Biomedical Important Organic Compounds

Abstract

Gamma ray attenuation parameters such as mass attenuation coefficient (µm),total atomic cross section (6t), electronic cross section (6e), effective atomic number (Zeff),Effective electron density(Neff), for Acetylsalicylic acid ( C9H8O4 ), Acetic acid (C2H4O2), Acetergamine (C4H7N5 ), Usnic Acid (C18H16O7), Erucic Acid (C22H42O2), Formic Acid (CH2O2)in the diagnostic energy range (0.122-1.330 MeV) were determined experimentally theoretically. Theoretical values were obtained from XCOMcode. In experiment, NaI(Tl) scintillation detector housed in a narrow beam geometry set up was utilized the measured attenuation of gamma rays. All samples were irradiated to gamma rays using point radioactive sources 57CO,133Ba,22Na,137Cs, 54Mn, and 60Co. From the obtained results of um6t,6e, Zeff and Neff, it is found that these gamma ray attenuation parameters of selected samples are affected by change in the energy of incoming photons. A fairly good agreement was observed between measured and XCOM data. The attenuation parameters were decreased with increase in energy of photons owing to the dominant photon interaction in the energy range 0.122 to 1.33 MeV except Zeff and Neff. The Zeff values of the organic compounds were observed between ∼3 to ∼4, agreed well with average atomic number.