Calculation of Photon Interaction Coefficients
Photons can interact through different processes with the nuclei of elements.
These processes, as well as the theories used to calculate the PARTIAL
interaction cross sections (interaction coefficients) of these processes, are
described in the following paragraphs:
Partial Coefficients are of interest for basic studies and are used primarily
in Monte Carlo simulations of photon interactions. Monte Carlo calculations
are too cumbersome and too expensive for use in practical engineering and
medical applications. For rapid calculations of Shielding and Dose
Deposition, two TOTAL coefficients were defined that can be derived by
measurements or by combination of theoretically calculated Partial
Coefficients. The definitions of these Total Coefficients, as well as methods
for their calculation, are discussed in the paragraphs
The program PHOTCOEF, written
for microprocessors running unter DOS and WINDOWS, calculates all
coefficients (linear and mass, partial and total) for elements, chemical
compounds, and for mixtures of elements and compounds.
On-line calculation of mass-coefficients of the elements can be done by a
program put on the Web by
CSRRI, the
Center for Synchrotron Radiation Research and Instrumentation of the
Illinois Institute of Technology.
www.nucleonics-online.com/621.html
Edited on 6 August 2001 - E-mail to the
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