1. NAME AND TITLE
LRSPC: Range and Stopping Power Calculator
LRSPC is one of a series of space codes developed in the 1960s. Between 19661968, this
code package was distributed five times. RSIC retains the series to preserve space technology.
Lockheed-Georgia Company, Nuclear Analysis Department, Marietta, Georgia.
3. CODING LANGUAGE AND COMPUTER
FORTRAN II and FAP; IBM 7090 and 7094.
4. NATURE OF PROBLEM SOLVED
The LRSPC program is designed to estimate the energy loss, due to ionization and excitation,
and the range of charged particles passing through matter. The code treats protons in elements or
mixtures composed of elements with atomic numbers ranging from 1 to 100. The results for
protons are generally valid from 1 MeV to 100 GeV. The code may be extended to treat other
charged particles such as muons, pions, hyperons, deuterons, tritons, and alphas by changing the
particle mass, charge, and range at 2 MeV.
5. METHOD OF SOLUTION
Stopping power is calculated from the Bethe-Bloch equation with shell and density corrections included. Range is calculated by integrating the reciprocal of the stopping power from an initial value at 2 MeV. The K-shell correction is taken from Walske's data. The L-shell and higher shell corrections are adjusted to fit low energy measurements for 30 elements. The density correction is calculated by a method similar to that of Sternheimer, differing chiefly in the large number of electron shells considered.
LRSPC computes improved proton range and stopping power data for use in the proton
penetration code, CCC-51/LPPC. It is packaged separately and may be requested independently.
6. RESTRICTIONS OR LIMITATIONS
Number of elements in mixture < 10
Atomic number of element < 100
Number of energy points < 500
7. TYPICAL RUNNING TIME
The code runs approximately 16 seconds per element for values at 230 energies. Estimated
running time of sample problem: 2 minutes, 20 seconds.
8. COMPUTER HARDWARE REQUIREMENTS
The code is designed for the IBM 7090 and 7094. It requires standard input, output and punch
tapes, two working tapes, and an on-line printer for operator instructions.
9. COMPUTER SOFTWARE REQUIREMENTS
The code requires a standard IBM FORTRAN II Monitor or the IBM IBSYS operating system
with a FAP assembler and a FORTRAN II compiler.
C. W. Hill, W. B. Ritchie and K. M. Simpson, Jr., "Data Compilation and Evaluation of
Space Shielding Problems, Vol. I, Range and Stopping Power Data," ER-7777 (July 1965).
11. CONTENTS OF CODE PACKAGE
The package contains the referenced document and one (1.2MB) DOS diskette on which is
writtenin separate filesthe source card decks, data for a sample problem, a BCD data library, and
output from the sample problem.
12. DATE OF ABSTRACT
July 1967; updated July 1981, February 1985.
KEYWORDS: CHARGED PARTICLES; RANGE; STOPPING POWER; SPACE RADIATION