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Updated: May 12, 2026

Dosimetry for Cell Irradiation using Orthovoltage (40-300 kV) X-Ray Facilities
Published on: February 20, 2021
Selection of an appropriate air kerma rate constant for 75Se sources
Blake H Currier1, John J Munro, David C Medich
1University of Massachusetts Lowell, Pananski Hall, One University Avenue, Lowell, MA 01854, USA. blake.currier@gmail.com
Abstract:
Monte Carlo simulation techniques using a Monte Carlo N-Particle code (MCNP5) analyzed six Source Production & Equipment Co., Inc., Se industrial radiography sources to determine an appropriate air kerma rate constant for Se, 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 cm h Ci (0.203 R m h Ci), 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 (75)Se source.
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