1. NAME AND TITLE
NCRP49: X-Ray Shield Calculation System.
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
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
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.
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,
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.
KEYWORDS: MICROCOMPUTER; X-RAY; SLAB; PARAMETRIC MODELS