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Manuscript Title: MLOG, the simultaneous standardization of multi-nuclide mixtures.
Authors: A. Grau Carles
Program title: MLOG
Catalogue identifier: ADCH_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 93(1996)48
Programming language: Fortran.
Computer: IBM AT 80386.
Operating system: MS-DOS 3.30 AND HIGHER.
RAM: 100K words
Word size: 32
Keywords: Radionuclide mixture, Simultaneous Standardization, Spectral interpolation, Radiostrontiums, Radioactive wastes, Liquid scintillation Counting, CIEMAT/NIST method.
Classification: 17.7.

Nature of problem:
The analysis of liquid radioactive wastes from reserach laboratories, hospitals and nuclear power stations frequently requires tedious chemical separations. We can significantly reduce this experimental work by applying a simultaneous standardizaton method. Liquid scintillation specrometry offers two main advantages. On the one hand, we can practically detect all nuclear decay processes; i.e., alpha, beta, gamma or electron capture. On the other, the preparation of samples is rapid and simple. However, the poor resolution of liquid scintillation spectrometers and the effects of quenching on the pulse height spectra complicate the standardization procedure.

Solution method:
We take advantage of the spectral shape differences between the component spectra to compute by least square fitting each nuclide counting rate. The effects of quenching on the pulse-height spectra are corrected by spectral interpolation. We standardize each component in the mixture by the CIEMAT/NIST method.

Restrictions:
The program MLOG does not detect components with counting rate ratios less than 1/200. The application of the program is restricted to logarithmic pulse-height spectrometers.

Running time:
The test run requires about 2 minutes on an IBM AT.