**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.

**KEYWORDS: ** GAMMA-RAY; NEUTRON; KERNEL; COMPLEX GEOMETRY;
COMBINATORIAL GEOMETRY