Segmented G(E) Function Compensation Method for Gamma Dose Rate Meters Considering Asymmetric Error Distribution Across Energy Regions
Year: 2026
Type: article
Abstract: Gamma dose rate meters are used in environmental radiation monitoring and radiation safety assessment. Conventional global G(E) functions can concentrate dose conversion errors at low energies. A segmented G(E) compensation method based on the multi-segment least-squares method (MSLSM) was developed for a compact CsI(Tl)–silicon photomultiplier (SiPM) meter, with separate functions for 20–200 keV and 200 keV < E ≤ 2000 keV. Full-spectrum fitting mean absolute percentage error (MAPE) decreased from 10.36% to 5.83%, a relative reduction of 43.73%, while low-energy MAPE decreased from 22.32% to 11.42%. For simulated nuclide spectra, the 241Am relative deviation decreased from 9.17% to 1.83%; results for 137Cs, 60Co, and most mixtures were comparable to or slightly better than those of the conventional global least-squares method (LSM). After correction, the maximum absolute relative deviations between the prototype meter and the commercial SAM945 instrument were approximately 7.5% for 137Cs and 14.91% for 60Co. Segmented G(E) modeling thus improves the regional error distribution and dose rate fitting accuracy over a wide energy range for the detector studied.
Source: Symmetry
DOI: 10.3390/sym18111874
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,896
OpenAlex ID: W7225614002