1. NAME AND TITLE
BRHGAM: Monte Carlo Estimation of Absorbed Dose from X-Ray Sources in Phantom Man.
Oak Ridge National Laboratory, Oak Ridge, Tennessee.
3. CODING LANGUAGE AND COMPUTER
Fortran IV, Assembler language; IBM 360/370.
4. NATURE OF PROBLEM SOLVED
BRHGAM is a Monte Carlo computer program which is utilized to calculate estimates of absorbed dose in several body organs of an adult human phantom. The source of radiation is a simulated external beam of X-rays in the energy range 20 to 150 keV.
BRHGAM was compiled from elements of ALGAM, a Monte Carlo computer code for estimating
internal photon dose, and newly written sub-programs.
5. METHOD OF SOLUTION
Primarily, the code has been used with normally incident 4 x 4 cm collimated parallel monoenergetic photon beams of 30, 55, and 80 keV. By changing certain input parameters, the incident angle of the beam, the beam size, and the initial energy of the beam might be varied. With the output of the code, it is possible to obtain dose from a larger beam by adding together the data from a number of 4 x 4 beams.
BRHGAM has a main program which generally controls the flow of the code by initializing or
terminating each step of the code. The main program also controls the beginning input, the beginning
and ending of the history of each photon, the ending of all of the histories, and the final output.
6. RESTRICTIONS OR LIMITATIONS
The code was modified specifically for the situation of external rectangular beam sources of
monoenergetic photons impinging on an adult human phantom next to a diagnostic table. No other
configuration is permitted. Location of the table, the beam size, and the beam angle may vary from
exposure to exposure, but not from run to run. Only the location of the beam impingement site may
vary between runs.
7. TYPICAL RUNNING TIME
The sample problem took 5 minutes on the IBM 360/91.
8. COMPUTER HARDWARE REQUIREMENTS
BRHGAM is operable on the IBM 360/370 computers. It requires 138 K storage.
9. COMPUTER SOFTWARE REQUIREMENTS
Fortran H and Assembler compilers are required. The code uses standard I/O plus 1 additional
G. G. Warner, Informal Notes, (January 1974).
G. G. Warner, "BRHGAM: A Medical X-Ray Dose Estimation Program," ORNL-TM-4393
11. CONTENTS OF CODE PACKAGE
Included are the referenced documents and one (1.2MB) DOS diskette which contains the source
codes and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: MONTE CARLO; X-RAY; PHANTOM