Pozicijski osjetljivi detektori gama zračenja

master's thesis

• Title (english): Position sensitive gamma ray detectors
• Author: Ana Marija Kožuljević
• Mentor: Mihael Makek (mentor)
• Committee member: Mihael Makek (predsjednik povjerenstva)
• Committee member: Ivica Smolić (član povjerenstva)
• Committee member: Nikola Poljak (član povjerenstva)
• Committee member: Matko Milin (član povjerenstva)
• Committee member: Davor Horvatić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2019-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

U ovom radu su ispitane energijske rezolucije scintilacijskih detektora u raznim geometrijskim konfiguracijama i s nekoliko optičkih veziva, te su rezultati korigirani s obzirom na nelinearni odgovor detektora. Konstruirani su detektori od kristala GaGG:Ce i silicijskih fotomultiplikatora, te u konfiguraciji sa svjetlovodom, a mjerenja su provedena na nekoliko vrijednosti napona. Također, napravljena su mjerenja na nekoliko vrijednosti napona s kristalima CsI:Tl, pomoću kojih su se testirala svojstva kristala s različitim izolacijskim sredstvima te optičkim vezivima. Napravljena je usporedba opaženih vrijednosti energijskih rezolucija detektora ove dvije vrste kristala za gama zračenje od 511 keV. Ovakvi detektori, mogu se posložiti u matrice i čine temelj svih pozicijskih osjetljivih detektora gama zračenja u medicinskom oslikavanju, radioekologiji ili nuklearnoj sigurnosti.

Abstract (english)

In this study, energy resolutions of scintillating crystals were tested in different geometric configurations and with several optical connectors. The results were corrected for the influence of the nonlinear response of the silicon photomultiplier. Constructed detectors consist from GaGG:Ce crystals and silicon photomultipliers, and in combinations of GaGG:Ce crystals and a light guide. Measurements were made on several different values of voltage. Detectors were also constructed with CsI:Tl crystals, which were submitted to measurements on different values of voltages. These detectors were tested with different isolating materials and optical connectors. Energy resolutions of the detectors, derived from the measurements of gamma radiation at the energy of 511 keV, are compared. These detectors can make a matrix configuration, and in this configuration they are essential in position sensitive gamma ray detectors in medical imaging, radio-ecology and nuclear safety.

• Keywords: scintilacijski detektori; scintilacijski kristali; silicijski fotomultiplikator
• Keywords (english): scintillation detectors; scintillation crystals; silicon photomultiplier
• Language: croatian
• URN:NBN: urn:nbn:hr:217:699391
• Study programme: Title: Physics; specializations in: Research; Course: Research; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: magistar/magistra fizike (magistar/magistra fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2020-09-27
• Created on: 2020-01-07 10:19:53