1. NAME AND TITLE

NCRP49: X-Ray Shield Calculation System.

2. CONTRIBUTORS

Rhode Island Department of Health, Providence, Rhode Island.

U.S. Environmental Protection Agency, Region I, Boston, Massachusetts.

3. CODING LANGUAGE AND COMPUTER

BASIC; TRS-80 Model II and Model 4, IBM PC.

4. NATURE OF PROBLEM SOLVED

NCRP49 will calculate the primary and/or secondary leakage/scatter barrier requirements (in mm of lead) for diagnostic radio-graphic and/or fluoroscopic x-ray units operating at 50, 70, 100, 125 or 150 kV.

5. METHOD OF SOLUTION

NCRP49 uses the methodology described in the appendices of NCRP Report No. 49 (1976) and the method of Douglas and Archer et al.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

NCRP49 method is interactive; the method of Douglas-Archer takes several minutes.

8. COMPUTER HARDWARE REQUIREMENTS

Operable on TRS-80 Model II/12/16, TRS-80 Model 4, or IBM PC.

9. COMPUTER SOFTWARE REQUIREMENTS

NCRP49 was written in BASIC for operating under TRSDOS 2.0. It will also run under TRSDOS 4.X. The BASIC is consistent with Microsoft 1.2 but may be implemented under any similar BASIC language. The Model 4 version was implemented under TRSDOS 6.1.2. The IBM PC version was implemented under PC-DOS 2.0.

10. REFERENCES

a. Provided with the package

William P. Dundulis, Jr., informal notes.

b. Background information

Structural Shielding and Design and Evaluation for Medical Use of X Rays and Gamma Rays of Energies up to 10 MeV, NCRP Report 49, National Council on Radiation Protection and Measurements, Sept. 1976.

B. R. Archer, J. I. Thornby, S C. Bushong, "Diagnostic X-Ray Shielding Design Based on an Empirical Model of Photon Attenuation," Health Physics 44(5), 507-517 (1983).

C. H. Douglas, Program 508050, Texas Instruments PPX-59 Professional Program Exchange, (March 1980).

11. CONTENTS OF CODE PACKAGE

The package contains the reference in (10.a) and one (1.2MB) DOS diskette on which the program versions are written as ASCII files.

12. DATE OF ABSTRACT

October 1984; update April 1985, June 1987.