Supervisors info:
Παντελής Καραΐσκος, Καθηγητής, Ιατρική, ΕΚΠΑ
Κωνσταντίνος Ποτηριάδης, Διδάκτωρ, ΕΕΑΕ, Δημόκριτος
Κωνσταντίνος Καρφόπουλος, Διδάκτωρ, ΕΕΑΕ, Δημόκριτος
Summary:
In this IP, the calibration of an HPGe detector belonging to the Greek Atomic Energy Commission (GAEC) was carried out in order to be able to use the in-situ measurement in the field.
In the second chapter of the IP, the concept of in situ spectroscopy, the way it is applied in the field and the information obtained from it is theoretically developed. In addition, the in situ method is compared with the laboratory soil sample analysis method. Finally, reference is made to the various applications in which in situ spectroscopy can be used.
In the third chapter, the semi-empirical method of calibrating the probe for in situ measurement in the field as discussed in the literature is analyzed (Beck H. et al., 1972) (Miller K. and Shebell P., 1993). The main factor calibration, its significance as well as the equation through which it was calculated. The three sub-factors of this relationship are then analyzed in more detail. This analysis includes bibliographic illustrations in the form of figures for these coefficients, as well as tables necessary for their identification. Also, the mathematical relations through which (from the above-mentioned literature) is determined the flow that reaches the detector from isotopes located on the ground. Finally, the sources of uncertainty that arise in an in situ measurement in the field are listed.
In the fourth chapter, we describe the experimental calibration process carried out in this IP. Description of the characteristics of the detector used as well as the individual systems that are necessary for the experiment (including photographic material). The experimental procedure for determining the individual ratios of the calibration master equation is then described. The results of the experimental measurements are then shown in tables and curves, while comparison is made with the bibliography for checking their correctness.
Finally, the calculation results of the main calibration coefficient, as well as the conclusions for the possible future use of the calibration curve of the particular PI for in situ measurement in the field, are shown.
Keywords:
Germanium detector, Calibration procedure, Statistical uncertainties, Main calibration factor
