Određivanje dubine interakcije gama zračenja u segmentiranim scintilacijskim detektorima

master's thesis

• Title (english): Determination of the depth of gamma-ray interaction in segmented scintillation detectors
• Author: Damjan Šišul
• Mentor: Mihael Makek (mentor)
• Committee member: Mihael Makek (predsjednik povjerenstva)
• Committee member: Maja Planinić (član povjerenstva)
• Committee member: Darko Androić (član povjerenstva)
• Committee member: Miroslav Požek (član povjerenstva)
• Committee member: Ivica Friščić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2022-09-29, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

U ovom radu ispitivana je mogućnost određivanja dubine interakcije gama zračenja u segmentiranim scintilacijskim detektorima. Dubina interakcije određivana je na temelju analize količine dijeljene svjetlosti između susjednih scintilacijskih detektora. U eksperimentu su korištena dva segmentirana scintilacijska detektora, svaki načinjen od 16 LFS (lutecijski fini silikat) kristala, veličine 3.14 mm x 3.14 mm x 20 mm, posloženih u matrice 4 x 4, spojena na silicijske fotomultiplikatore. Na jednu matricu je postavljen pleksiglas debljine 1 mm, koji omogućava dijeljenje svjetlosti medu kristalima. Kao izvor gama zračenja korišten je uzorak radioaktivnog 22^Na. Kalibracijska skala je napravljena prema energijskom vrhu od 511 keV. Mjerenja su izvršena na nekoliko različitih dubina gdje se pomoću kolimatora unaprijed kalibrirala dubina na kojoj će se događati interakcije s gama fotonima. Analizom energija na segmentima, susjednim onome na kojem se dogodila sama interakcija, određena je ovisnost količine dijeljene svjetlosti o dubini interakcije. Na temelju te ovisnosti, potom se može odrediti dubina interakcije za slučajeve kada dubina interakcije nije unaprijed poznata.

Abstract (english)

In this work, the possibility of determining the depth of interaction of gamma-rays in segmented scintillation detectors was investigated. The depth of interaction was determined based on the analysis of the amount of shared light between adjacent scintillation detectors. Two segmented scintillator detectors were used in the experiment, each made of 16 LFS (lutetium fine silicate) crystals, size 3.14 mm x 3.14 mm x 20 mm, arranged in 4 by 4 matrices, connected to silicon photomultipliers. A 1 mm thick plexiglass was placed on one matrix, which enabled light to be shared between the crystals. A sample of radioactive 22^Na was used as a source of gamma radiation. The calibration scale was made according to the energy peak of 511 keV. Measurements were made at several different depths where the collimator was used to precalibrate the depth at which interactions with gamma photons will occur. By analysing the energy on the segments adjacent to the one in which the interaction itself took place, the dependence of the amount of shared light on the depth of interaction was determined. Based on this dependance, the depth of interaction can then be determined for cases where the depth of interaction is not known in advance.

• Keywords: gama zračenje; segmentirani scintilacijski detektor; silicijski fotomultiplikator; metoda dijeljenja svjetlosti
• Keywords (english): gamma-ray; segmented scintillation detectors; silicon photomultiplier; light sharing method
• Language: croatian
• URN:NBN: urn:nbn:hr:217:660646
• Study programme: Title: Physics; specializations in: Education; Course: Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra edukacije fizike (magistar/magistra edukacije fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-10-18 08:42:18