NEA-0969: EDMULT-6.4, Electron Depth Dose Distribution in Multilayer Slab Absorbers

Program-name Package-ID Status EDMULT NEA-0969/01 Obsolete EDMULT-3.11 NEA-0969/02 Obsolete EDMULT-6.3 NEA-0969/03 Obsolete EDMULT-6.4 NEA-0969/04 Tested

Machines used: Package-ID Orig.Computer Test Computer NEA-0969/04 IBM PC Linux-based PC,PC Windows

3. DESCRIPTION OF PROGRAM OR FUNCTION - EDMULT evaluates depth-dose distributions produced by plane-parallel electron beams normally incident on one- to six-layer slab absorbers. The information produced by EDMULT are differential and integral energy-deposition by an electron beam as a function of the depth in the absorber.

4. METHOD OF SOLUTION - EDMULT is based on an analytic expression of the depth-dose curve in semi-infinite medium and a simple model of electron penetration through a multilayer absorber. The effect of the different medium beyond an interface is accounted for by the difference of backscattering, which is evaluated by considering the branching of electron beam into transmitted and backscattered components.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - EDMULT is valid for incident-electron energies from 0.1 to 20 MeV and for absorbers consisting of slabs of atomic numbers from about 4.75 (polyethylene) to 92. When the absorber consists of six layers, the last layer should be thick enough to stop essentially all the electrons incident on it. Treatment of the bremsstrahlung component of energy deposition in multilayer absorbers is yet incomplete.

6. TYPICAL RUNNING TIME - The computation time required to evaluate a depth-dose profile consisting of 50 points for a six-layer absorber is less than a sec on most desk-top computers.

7. UNUSUAL FEATURES OF THE PROGRAM -

8. RELATED AND AUXILIARY PROGRAMS -

9. STATUS
NEA-0969/01: 28-JAN-2003 Obsolete
NEA-0969/02: 10-JAN-2003 Obsolete
NEA-0969/03: 10-JAN-2003 Obsolete
NEA-0969/04: 19-MAY-2004 Tested at NEADB

10. REFERENCES -
- Rinsuke Ito and Tatsuo Tabata:
"Semi-empirical Code EDMULT for Depth-Dose Distributions of Electrons in Multilayer Slab Absorbers: Revisions and Applications," Radiation Center of Osaka Prefecture Technical Report No. 8 (November 1987)
(This document refers to an old version, but the method of solution described is the same as the present version. A revised version in the form of a PDF file is under preparation.)
NEA-0969/04:
- T. Tabata, P. Andreo and K. Shinoda:
An algorithm for depth-dose curves of electrons fitted to Monte Carlo data
Radiation Physics and Chemistry 53(1998)205-215

11. MACHINE REQUIREMENTS - EDMULT is operable on any desktop or laptop computers as well as on mainframe computers. The compiled program requires less than 300 K bites of RAM.

12. PROGRAMMING LANGUAGE(S) USED -
NEA-0969/04: FORTRAN-77

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - The code is operable on any operating system with a FORTRAN compiler.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -

15. NAME AND ESTABLISHMENT OF AUTHORS -
Institute for Data Evaluation and Analysis, Sakai, Osaka, Japan;
Research Institute for Advanced Science and Technology, Osaka Prefecture University, Sakai, Osaka Japan;
Shanghai Applied Radiation Institute, Shanghai University, Jia Ding, Shanghai, China;
Department of Radiation Oncology, Indiana University school of Medicine, Indianapolis, IN, USA

16. MATERIAL AVAILABLE -
NEA-0969/04:
EDCAL.FOR FORTRAN source of a sample calling program for EDMULT
EDMULT.FOR   FORTRAN source of the EDMULT code, version 6.4
EXAMPLE.DAT  Sample data set for a six-layer problem
EXAMPLE.OUT  Output of the sample run with the data, EXAMPL.DAT
SCIENCE.PDF Documentation
README file

17. CATEGORIES -

- J. Gamma Heating and Shield Design

Keywords: ABSORPTION, DOSES, ELECTRONS, ONE-DIMENSIONAL, SHIELDING, SLABS