1. NAME AND TITLE

QAD-UE: A Revised Numerical Integration Option for Gamma-Ray Volume Source Problems in the QAD-CG Point Kernel Shielding Code.

This version of QAD is based on CCC-307/QAD-CG and contains all the options and features of QAD-CG.

2. CONTRIBUTOR

United Engineers and Constructors Inc., Philadelphia, Pennsylvania.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; Honeywell 66/60.

4. NATURE OF PROBLEM SOLVED

QAD-UE is a point-kernel code for calculating fast-neutron and gamma-ray penetration through various shield configurations defined by combinatorial geometry specifications. This version of QAD incorporates a revised gamma-ray point kernel source volume integration option to reduce user setup time and provide increased computational efficiency for large volume source problems.

5. METHOD OF SOLUTION

QAD-UE uses a point kernel ray-tracing technique for gamma-ray calculations and either a modified Albert-Welton kernel or kernels obtained from the moments method solution of the Boltzmann equation for neutron penetration calculation. The new technique performs a coupled ray angular integration at the detector position as opposed to an integration over the source volume.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for QAD-UE.

8. COMPUTER HARDWARE REQUIREMENTS

QAD-UE is operable on the Honeywell 66/60 computer.

9. COMPUTER SOFTWARE REQUIREMENTS

The operating system for the Honeywell is GCOS3. A Fortran IV compiler is required.

10. REFERENCES

N. De Gangi, "A Revised Numerical Integration Option for Gamma Ray Volume Source Problems in the QAD-CG Point Kernel Shielding Code," NU-542 (April 1983).

V. R. Cain, "A Users Manual for QAD-CG, the Combinatorial Geometry Version of the QAD-P5A Point Kernel Shielding Code," NE007 (July 1977).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

January 1984.