1. NAME AND TITLE
CDR: A Constant Dose Range Code System, Using the LANL-NWEF Neutron-Gamma-Ray
Air Flux Tape.
CDR was developed from the DOSE and SLANT computer programs which are reported by S.
A. Dupree in NWEF Report 1040 and NWEF Report 1044.
Naval Weapons Evaluation Facility, Kirtland Air Force Base, New Mexico.
Los Alamos Scientific Laboratory, Los Alamos, New Mexico.
3. CODING LANGUAGE AND COMPUTER
FORTRAN IV; CDC 6000 (A), IBM 360/75/91 (B).
4. NATURE OF PROBLEM SOLVED
CDR is designed to calculate ranges of constant dose from a point source of radiation in the
atmosphere. It scales the results of transport calculations in uniform, sea-level air. CDR combines
all the capabilities of earlier versions and is designed to use as input the LANL-NWEF air flux tape
or the flux dump from a coupled neutron-gamma-ray transport calculation from a computer
program such as CCC-42/DTF-IV. The air flux data consists of complete transport calculations in
uniform, sea-level air for one source neutron in each of 30 energy groups and one source photon in
each of 12 energy groups. The program uses the air flux tape to produce ranges of constant dose
from a point source in the atmosphere.
5. METHOD OF SOLUTION
The LANL-NWEF air flux tape contains complete transport calculations for one source neutron
in each of 42 energy groups and one source photon in each of 12 energy groups. CDR folds the
user's source spectrum with the air flux data to determine the resulting flux by group and space
point to a distance of 5 kilometers in uniform, sea-level air. The appropriate dose conversion
factors are applied to this data and the results scaled to provide ranges of constant dose in the
atmosphere. The code is designed for user convenience and makes extensive use of free form
6. RESTRICTIONS OR LIMITATIONS
Because uniform air results are used in CDR, the results may be in significant error near the
air-ground interface or at high altitudes where scaling is performed over more than one atmospheric scale height.
7. TYPICAL RUNNING TIME
Ignoring compile time and the time required to read the air flux tape, the calculations require
approximately 0.2 seconds of CPU time on the CDC 6600 computer per constant dose contour.
RSIC recorded one minute of running time for the sample problem on the IBM 360/75.
8. COMPUTER HARDWARE REQUIREMENTS
CDR requires approximately 110,000 (octal) central core. It requires the air flux tape in binary
form and all output is to a line printer.
9. COMPUTER SOFTWARE REQUIREMENTS
A FORTRAN H compiler is required.
J. E. Campbell and H. A. Sandmeier, "Air Transport Calculations Using the LASL-NWEF Air
Flux Tape and the NWEF Computer Program - CDR," NWEF 1090 (April 1972).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains control
cards, source codes, sample problem input and output, plus air flux data.
12. DATE OF ABSTRACT
KEYWORDS: NEUTRON; GAMMA-RAY; PARAMETRIC MODELS; RADIATION ENVIRONMENT; AIR TRANSPORT