Software for Calibration in Gamma-Ray Spectrometric In-situ Measurements

A gamma-ray spectrometric measurement on site, or in-situ in Latin, can identify and quantify the radionuclides after a radioactive fall-out and provide results quickly. The efficiency of such a measurement, also called the calibration factor, is depending on many parameters on the site. These parameters may consist of uncertainties, and the quality of the measurement result is given by the combined uncertainty. A software, including graphical user interfaces, was developed in MatLab R2014b to provide the calibration factor and its combined uncertainty for in-situ gamma-ray spec-trometric measurements. The field-of-view of the detector was also provided by the software. Depending on how the radionuclides were deposited on and/or in the soil, four deposition models were considered in this work. In order to estimate the combined uncertainty, a numerical approach was used. The samples for each input quantities were taken according to the Latin Hypercube Sampling (LHS). Moreover, the samples could be assumed to have either uniform, triangular or normal distribution. The software gave reliable results about the calibration factor and its combined un-certainty. Also, the detector’s field-of-view that was calculated was reasonable. However validations need to be performed for some of the models