1. NAME AND TITLE

REBEL-3: Adjoint Monte Carlo Calculation of Radiation Doses to Human Organs in Dwelling Rooms.

2. CONTRIBUTORS

Central Research Institute of Physics, Budapest, Hungary.

U.S. DOE Environmental Measurement Laboratory, New York, New York.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; ICL 1905 (C00299ICL0000), CDC 6600 (C00299C660000), and IBM 360/370 and R-40 (C00299I036000) computers.

4. NATURE OF PROBLEM SOLVED

The REBEL-3 adjoint Monte Carlo code calculates the doses in the whole body, in the testicles, ovaries, red or yellow marrow, or in the lungs of an inhomogeneous phantom standing in a dwelling room. In addition, it can calculate the exposure rate in air. Separate results are given for the three most important gamma-ray emitters (⁴⁰K, U/Ra-chain and Th-chain) of the usual wall materials. The measurements of the rectangular block room, the thicknesses and the material composition of the walls as well as of any number of neighboring rooms can be specified in the input.

5. METHOD OF SOLUTION

Contributions of the uncollided (source) and those of the scattered photons are first given separately, but subsequently their sums are printed. Total dose ratesweighted sums from all three kinds of sourcescan be calculated if the specific activities (together with their errors) are given in the input. A new energy sampling technique has been developed for the adjoint transport simulation.

6. RESTRICTIONS OR LIMITATIONS

The room is a rectangular block, the parallel walls have equal thicknesses, the walls are homogeneous, there are no doors or windows, the phantom is oriented in a specific way.

The Monte Carlo procedures are terminated if (1) the number of simulations reaches a preset maximum; (2) the running time exceeds the allowed maximum; (3) the coefficient of variation characterizing the statistical error of the calculated dose falls below the required limit.

7. TYPICAL RUNNING TIME

RSIC made no check on running time for REBEL-3.

8. COMPUTER HARDWARE REQUIREMENTS

The code can be run on the ICL 1905, the CDC 6600, the IBM 360/370 or the R-40 computer, which is similar to the IBM 360.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN compiler and a random number generator are required.

10. REFERENCES

L. Koblinger, "REBEL-3: A Code for Calculating Doses in the Organs of a Phantom Standing in a Dwelling Room," KFKI-1980-07 (February 1980).

L. Koblinger, "REBEL-2: An Adjoint Monte Carlo Code for the Calculation of Radiation in Dwelling Rooms," KFKI-76-65 (August 1976).

L. Koblinger, "A New Energy Sampling Method for Monte Carlo Simulation of the Adjoint Photon Transport Equation," KFKI-76-57 (July 1976).

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

December 1981.