home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OS/2 Shareware BBS: Science
/
Science.zip
/
gammas13.zip
/
readme.txt
< prev
next >
Wrap
Text File
|
1995-02-07
|
3KB
|
89 lines
GammaSun V1.3
description: deconvolution program and solver for equation systems
suggested destination: \32bit\educate
GammaSun V1.3 is public domain
abstract:
GammaSun is mainly a deconvolution program for spectra
of photons, but may be used for solving i-dimensional
equation systems of the form too:
y = R * x
y = measured data
x = true data
R = response of the experiment
for the x. Expected you have measured experimental
data y, then you can calculate in some cases the
true experimental data x by solving the equation system:
x = R^{-1} * y
R^{-1} is the inverse of the response matrix R
of the experimental system.
With GammaSun R^{-1} can be calculated by:
i) Gauss-Jordan
ii) LU-decomposition
iii) SVD-decomposition
The calculation of R^{-1} for higher dimensions
is not stable when using the machine precision
of 64 bit for mantissa and exponent. In those
cases minimization methods for chi in
chi = y - R * x
may be more successful:
iv) SAND-II
v) SVD-Fit
Most of these methods are extreme time consumptive.
An alternative is a quick and dirty method:
vi) stripping method
Additional features of GammaSun are:
- calculation of doses H^*, H_p, H'
- smoothing data by Fourier, Savitzky-Golay
- C-like parser-script language for a quick
generation of response matrices
- Peak analysis of deconvoluted spectra
- plotting emission probability of several photons
- simulation of response spectra for well determined
response matrices
- numeric tests of the inverted matrix
- checking the residuum
If you found bugs, or you want remark a suggestion send
it by using e-mail:
Reinhard Alt R.Alt@tu-bs.de
further reading
- W. H. Press, P. A. Teukolsky, W. T. Vetterling, B. P. Flannery;
em Numerical Recipes in C --- The Art of Scientific Computing
Second Edition (1992),
- W. R. Leo; Techniques for Nuclear and Particle Physics Experiments --- A How-to Approach
Springer-Verlag; 2. Auflage (1994); ISBN 3-540-57280-5
- S. Berg, W. N. McElroy; A computer automated iterative method for neutron flux spectra
determination by foil activation -- SAND-II; Air Force Weapons Laboratory,
Research and Technology Division; (1967)
- U. Schötzig und H. Schrader;
Halbwertszeiten und Photonen-Emissionswahrscheinlichkeiten von häufig
verwendeten Radionukliden;
4. erweiterte Auflage, PTB-Bericht PTB-Ra-16/4, ISBN 3-89429-349-7, (1993)
- M. Matzke; Unfolding of Pulse Height Spectra -- The HEPRO Program System;
Physikalisch-Technische Bundesanstalt (Deutschland) (1994)
- GammaSun online manual