A new algorithm for calculating efficiency calibration has been implemented. It is based on orthonormal polynomial approximation and is capable of dealing with polynomials of degree up to 12 and to handle up to 20 experimental points. Additional utilities have been provided to control the calibration procedure including restriction of the maximal polynomial degree, applying corrections for coincidence summing, managing experimental data set (rejecting/restoring data from calculation) and graphical representation of the resulting curve and so on.
A program for qualitative and quantitative analysis of spectra obtained by comparative NAA method is described. It includes peak search, calculation of essential peak parameters, isotope identification and estimation of concentrations and/or detection limits of nuclides, corrected for cooling time and decay during measurement. Corrections for blank samples and peak interference are performed as well. Uncertainties estimation of final results are performed according to the error propagation law. The program is aimed to help an experienced user to calculate the results of analysis but the possibility for automatic mode for routine analysis is provided as well.
A program (ANA) for evaluation of -spectra is reported. The program is based on a nonlinear least-squares procedure which uses a composite algorithm called KATOK. The program includes spectrum visualization, energy and FWHM calibration, automatic peak search with data preparation, possibility for manual data preparation and utilities.
Authors:T. Schifer, I. Kuleff, P. Mishev, and E. Pernicka
The problems of determination of zinc in clay, ceramics and soils via 65Zn using INAA are discussed. The applicability of different approaches for solving the influence of 46Sc and 152Eu by gamma-spectrometry on the line of 65Zn at 1115.5 keV are experimentally evaluated. The application of the correction program ANGES for the calculation of the net peak area is demonstrated. All discussed approaches are checked by analyses of 10 SRM"s: Ohio Red Clay, Lefkandi brick, IAEA-SRM-Soil-1, IAEA-SRM-Soil-5, IAEA-SRM-Soil-7, IAEA-SRM-SL-3, GBW-08303, GBW-07406, NIST-SRM-2709 and BCR-SRM-520.