1. NAME AND TITLE

BREMRAD: External and Internal Bremsstrahlung Calculation Code.

2. CONTRIBUTOR

Chemical Laboratory, Battelle-Northwest Laboratories, Richland, Washington.

The contributing installation was known as Hanford Atomic Products Operation, General Electric Company, while the code, BREMRAD, was in the process of development. The technology dates to the early 1960's. It was distributed by RSIC seven times between 1965-1979.

3. CODING LANGUAGE AND COMPUTER

FORTRAN; IBM 7090 and 7094.

4. NATURE OF PROBLEM SOLVED

BREMRAD was developed to calculate bremsstrahlung spectra for a thick target for use in shielding calculations.

5. METHOD OF SOLUTION

The code BREMRAD was developed for calculating external bremsstrahlung by the method of Bethe and Heitler as extended by Elwert, and internal bremsstrahlung by the method of Knipp and Uhlenbeck. Internal bremsstrahlung is defined to be radiation emitted when a beta particle leaves a nucleus. When a beta particle is absorbed, the radiation is called external bremsstrahlung. For each photon energy, the output contains the number of photons per beta from internal bremsstrahlung, and from external bremsstrahlung with up to four atomic absorbers multiplied by the photon energy interval specified as input. There is an option for obtaining the results in different units.

6. RESTRICTIONS OR LIMITATIONS

There is no available information at this time to indicate restrictions or limitations that may apply.

7. TYPICAL RUNNING TIME

Running time estimated for a typical problem is 3 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

The code is designed for an IBM 7090 and 7094. A 32,768 core memory and three tape units are used.

9. COMPUTER SOFTWARE REQUIREMENTS

The code was written to be compiled and executed in the IBM FORTRAN II Monitor System. Only input, output, and system tape assignments are made.

10. REFERENCE

H. H. Van Tuyl, "BREMRAD, A Computer Code for External and Internal Bremsstrahlung Calculations," HW-83784 (September 1964).

11. CONTENTS OF CODE PACKAGE

The package contains the referenced document and one (1.2MB) DOS diskette on which is written in four files: the source card deck, input data for a sample problem, Fermi Function data, and output from the sample problem.

12. DATE OF ABSTRACT

January 1966; updated July 1981, February 1985.