Vol. 53, No. 5
November 1999
pp. 851-855

Effect of collimator size and absorber thickness on gamma ray attenuation measurements for bakelite and perspex

GURDEEP S SIDHU, KARAMJIT SINGH, PARJIT S SINGH and GURMEL S MUDAHAR*

Physics Department, Punjabi University, Patiala 147 002, India
*Author for correspondence
MS received 26 April 1999; revised 23 July 1999

Abstract.

The mass attenuation coefficient (m m ) of 662 keV gamma rays have been measured in the extended media of bakelite and perspex under different collimation conditions. The increase in attenuation coefficient is seen with increase in sample thickness as well as with collimator size due to the contribution of multiple scattered photons in the uncollided beam of 662 keV gamma rays.

Keywords. Attenuation coefficient; narrow beam geometry; multiple-scattered photons; half acceptance

angle.

PACS Nos 32.80.Cy; 32.80.Wr

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