M. T. Nikkinen

UNISAMPO, comprehensive software for gamma-spectrum processing

UNISAMPO is a new member of the SAMPO family of gamma-spectrum analysis programs running on Linux. Its portable graphical user interface relies on Tcl/Tk running an X-client, which obtains services from an X Window System server, allowing natural access to UNISAMPO over the Internet. UNISAMPO features a scripting ability for analyses of thousands of spectra. Peak search is based on stringent statistical criteria and peak fitting has optional step function under each peak of a multiplet. UNISAMPO will analyze 32K spectra with up to 2500 peaks, and 32 peaks in a single multiplet extending over a fitting interval of 1024 channels. It has an interface to the expert system SHAMAN for extensive peak interpretation and radionuclide identification.

The Nuclide Identification System SHAMAN in the verification of the Comprehensive Nuclear-Test-Ban Treaty

SHAMAN is an expert system for radionuclide identification and spectrum peak interpretation in gamma-ray spectrometry. SHAMAN utilizes a comprehensive reference library with 2616 radionuclides and 81,642 gamma-ray lines, as well as a rule base consisting of sixty inference rules. Identification results are presented both via a graphical user interface and as configurable text reports. SHAMAN has been installed as an automated radionuclide identifier, handling the last phase of the gamma-ray spectrum analysis of air filter samples in the Comprehensive Nuclear-Test-Ban Treaty (CTBT) environment, both at the International and National Data Centre level. SHAMAN is a powerful tool in this environment: it is shown to reach a peak explanation percentage above 99% for routine CTBT air filter spectra. However, SHAMANs true capabilities are revealed when anything unusual is detected in a spectrum.

WWW-based remote analysis framework for UNISAMPO and SHAMAN analysis software

Summary{\rtf1\ansi\ansicpg1250\deff0\deflang1038\deflangfe1038\deftab708{\fonttbl{\f0\froman\fprq2\fcharset238{\*\fname Times New Roman;}Times New Roman CE;}} \viewkind4\uc1\pard\scaps\f0\fs24 UniSampo\scaps0 and \scaps Shaman\scaps0 are well-established analytical tools for gamma-ray spectrum analysis and the subsequent radionuclide identification. These tools are normally run locally on a Unix or Linux workstation in interactive mode. However, it is also possible to run them in batch/non-interactive mode by starting them with the correct parameters. This is how they are used in the standard analysis pipeline operation. This functionality also makes it possible to use them for remote operation over the network. We have developed a framework for running \scaps UniSampo\scaps0 and \scaps Shaman\scaps0 analysis using the standard WWW-protocol. A WWW-server receives requests from the client WWW-browser and runs the analysis software via a set of CGI-scripts. Authentication, input data transfer, and output and display of the final analysis results is all carried out using standard WWW-mechanisms. This WWW-framework can be utilized, for example, by organizations that have radioactivity surveillance stations in a wide area. A computer with a standard internet/intranet connection suffices for on-site analyses. \par }