Simple Computer Codes for Evaluating Absorbed Doses in Materials Irradiated by Electron Beams T. Tabata RIAST, Osaka Pref. Univ. The 62nd ONSA Database.

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Presentation transcript:

Simple Computer Codes for Evaluating Absorbed Doses in Materials Irradiated by Electron Beams T. Tabata RIAST, Osaka Pref. Univ. The 62nd ONSA Database Committee, October 7, 1996, Osaka

Contents Modeling of Real Configuration Semiempirical Models for Depth–Dose Curves of Electrons * –Introduction, etc. –A Brief History and Principle of the Semiempirical Models (EDEPOS and EDMULT codes) –Applications of EDMULT –Future of Semiempirical Models –Conclusion *Mostly from the talk given at the Int. Workshop on Electron and Photon Transport Theory Applied to Radiation Dose Calculation, Sept. 18–22, 1995, Seattle, WA, U. S. A.

Real Configuration for Electron Beam Irradiation and a Simplified Model Real configuration Multilayer model Modeling of Real Configuration

Evaluation of Absorbed Dose D

Examples of Absorbed Dose Coefficient K SIMONS: Simonis, P. J. in “The handbook of Electron Beam Processing” (High Voltage Engineering, Vol. IND-001, 1975)

Comparison of EDEPOS (’96 Version) with ITS Monte Carlo Data

Comparison of EDEPOS with ITS Monte Carlo Data (Cont.)

Effect of Backing Material Effect of the Thickness of the Air Layer Applications of EDMULT

Effect of Backscattering for Different Sample Thicknesses Applications of EDMULT (Cont.)

Quick Evaluation of Depth–Dose Curves for Many Conditions –ASTM ( American Society for Testing and Materials ) Document E10.01 Applications of EDMULT (Cont.)

Energy Calibration of Accelerators Applications of EDMULT (Cont.)

Improved empirical relations –Extrapolated-range formula used in  TN (z) and T(z) (in press) Old equationNew equation

Improved empirical relations (Cont.) –Inspite of many improvements, however, we use tables of data and an interpolation method for limited numbers of absorbers to get higher precision. –Tables provided are: CSDA range Extrapolated range Energy-backscattering coefficient –Absorbers for which tables and interpolation are used are: Be, C, Al, Cu, Ag, Au, U A150, air, C552, PMMA, water, WT1

Improved EDEPOS code – ’95 version Solid line, new EDEPOS (’95 Ver.) Dashed line, old EDEPOS (’90 Ver.) Histogram, ITS Points, experiment from literature

Improved EDEPOS code (cont.) Comparison of the weighted relative rms Deviations δ averaged over energies from 0.1 to 20 MeV