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Selection of an Appropriate Air Kerma Rate Constant for 75Se Sources

H. Currier, Blake; Munro, John J. III; Medich, David C.

doi: 10.1097/HP.0b013e318284592c

Monte Carlo simulation techniques using a Monte Carlo N-Particle code (MCNP5) analyzed six Source Production & Equipment Co., Inc., 75Se industrial radiography sources to determine an appropriate air kerma rate constant for 75Se, factoring in source encapsulation and compared to a theoretical approximation. Based on this study, an air kerma rate constant was calculated to be 17.7 Gy cm2 h−1 Ci−1 (0.203 R m2 h−1 Ci−1), which was found to be five times lower than values published in the 1992 Edition of the Radiological Health Handbook and Oak Ridge National Laboratory RISC-45. Simulations were also employed to determine the effects of self-attenuation with the SPEC sources, the relationship between photon transmission values, and the thickness of various shielding materials in reducing exposure rates from a 75Se source.

*University of Massachusetts Lowell, Pananski Hall, One University Avenue, Lowell, MA 01854; †Source Production & Equipment Co., 113 Teal Street, St. Rose, LA 70087; §Worcester Polytechnic Institute, 100 Salisbury St., Worcester, MA 01609.

Authors Currier and Medich declare no conflict of interest; author Munro is Vice President at SPEC, Inc.

For correspondence contact Blake Currier at the above address, or email at

(Manuscript accepted 20 December 2012)

© 2013 by the Health Physics Society