# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (3): 36

### Pocket formula for mass attenuaion coefficient, effective atomic number and electron density of human tissues

H. C. Manjunatha1 • L. Seenappa1

1. 1 Department of Physics, Government College for Women, Kolar, Karnataka, India
• Received:2018-05-24 Revised:2018-08-09 Accepted:2018-09-13
• Contact: H. C. Manjunatha E-mail:manjunathhc@rediffmail.com
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H.C.Manjunatha, L.Seenappa. Pocket formula for mass attenuaion coefficient, effective atomic number and electron density of human tissues.Nuclear Science and Techniques, 2019, 30(3): 36
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Abstract: We have proposed a pocket formula for mass attenuation coefficient (μ/ρ), mass energy absorption coefficient (μen/ρ), and effective atomic number (Zeff) in different tissues of human organs. We have also assigned a new chemical formula for all studied tissues based on their composition. We have introduced a new parameter called effective composition index (Ceff). Based on this, we have introduced a new method to compute the effective atomic number. The evaluated photon interaction parameters are graphically represented. The evaluated average, maximum, minimum, and standard deviations of effective atomic number are tabulated. The proposed formula produces a mass attenuation coefficient, mass energy absorption coefficient, and effective atomic number from their composition