Investigation of Gamma-ray attenuation coefficients for some different tissues

Year 2019, NSP2018 Special Issue, 101 - 106, 28.03.2019

Hasan Gümüş Samer Mhanna Sümeyye G. Uzun

Abstract

In this study, the half-value thicknesses, linear and mass attenuation coefficients
of biological samples such as adipose tissue, bone, cardiac muscle, liver,
lung, muscle
skeletal and soft tissue have been measured at 97, 243.79,
344.89, 662, 778.43, 866.27, 962.31, 1112.87, 1173, 1333 and 1407.52 keV energies by using the NaI(Tl) spectrometer. The gamma-rays were obtained from ¹⁵²Eu, ¹³⁷Cs and ⁶⁰Co
sources. Also theoretical calculations have been performed in order to obtain
the half-value thicknesses, mass and linear attenuation coefficients, and the
tenth-value thicknesses at photon energies 0.001 MeV–10 GeV for the some tissues.The experimental
linear mass attenuation coefficients, half value layer for tissue components
were compared with theoretical values obtained using WinXCOM.

 The half-value
thicknesses, mass and linear attenuation coefficients, and the tenth-value
thicknesses of
tissue compounds have been computed in the wide energy region 1 keV to 10 GeV
using an accurate database of photon-interaction cross sections and the WinXCom
program. The linear attenuation coefficient for bone is higher than the tissues of cardiac muscle, liver, lung, skeletal muscle and soft
tissue.
HVL, TVL and mean free path are lower for bone
than
the tissues of cardiac muscle, liver, lung,
skeletal muscle and soft tissue. The studied gamma
dosimetric values for the relaxants are useful in medical physics and radiation
medicine. Result shows that attenuation and required thickness to
achieve certain attenuation power are highly photon energy dependent.

 

Keywords

Gamma Attenuation Coefficient; Half-Value Layer HVL, Tenth-value thickness TVL; Gamma Spectrometer

References

• [1] K. Olga, P. Andre, F. Jody, K. Igor, Mutat Res. 550, 59 (2004).
• [2] C.M. Davisson, R.D. Evans, Rev Mod Phys 24, 79 (1952).
• [3] D.M. Taylor, The radiopharmaceutical and its interaction with the patient. In: B.M. Mores, R.P. Parker, B.R Pullan, editors. Physical aspect medical imaging (Wiley, New York, 1981).
• [4] I. Bashter, Ann. Nucl. Energy. 17, 1389 (1997).
• [5] D.A. Bradley, C.S. Chong, A.M. Ghose, Phys. Med. Biol. 31, 267 (1986).
• [6] Y.S. Kim, Radiat. Res. 57, 38 (1974).
• [7] D.R. White, L.H.J. Peaple, T.J. Crosby, Radiat. Res. 8, 84 (1980).
• [8] S.A. Starck, S. Carlsson, Phys. Med. Biol. 42, 1957 (1997).
• [9] B. Axelsson, Ph.D. thesis, University of Stockholm. 1987.
• [10] C.E. Webber, Clin. Phys. Physiol. Meas. 8, 143 (1987).
• [11] M.A. Abdel-Rahman, E.A. Badawi, Y.L. Abdel-Hady, N.Kamel, Nucl. Instrum. Methods. A 447, 432 (2000).
• [12] A. Akar, H. Baltas, U. Çevik, F. Korkmaz, N.T. Okumuşoğlu, Journal of Quantative Spectroscopy and Radiative Transfer 102, 202 (2006).
• [13] J.H. Hubbell, S.M. Seltzer, National Institute of Standards and Technology, Physical Reference Data, 5632 (1995).
• [14] M.J. Berger, J.H. Hubbell, XCOM: photon cross sections database, Web version 1.2., available at hhttp://physics.nist.gov/xcomi. 1987/1999