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Development of a 4πβ (Plastic Scintillator) - 4πγ Detection System for by Heranudin

This thesis describes the development of a 4πβ - 4πγ detection system to perform primary standardisations of activity at the Radionuclide Metrology Laboratory at Australia’s Nuclear Science and Technology Organisation (ANSTO). Characterisation of the detectors, plastic scintillator for β-detector and well type NaI(Tl) detector for -detector, has been investigated by using Monte Carlo GEANT4 simulation and experimental measurement. Modelling of energy deposition in the scintillator and optical photon transport were employed the GEANT4 simulations. Several issues of the well type NaI(Tl) detector related to potential dead layer/inactive materials, full energy peak efficiency, coincidence-summing correction, and energy resolution broadening have been addressed. An optimum configuration of plastic scintillator detector for 60Co measurement was obtained to maximize electron detection probability and minimize photon interference probability at the same time. A hardware configuratio

Radionuclide metrology laboratory at australia nuclear scienceTechnology organisationRadionuclide metrology laboratoryNuclear scienceMonte carloPulse shape discriminatorPrimary standardisationsPlastic scintillatorAl tl detector

Characterisation of a well-type NaI(Tl) detector by means of a Monte C by Heranudin, M L Smith et al

Characterisation of a well-type NaI(Tl) detector by means of a Monte C by Heranudin, M L Smith et al
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Monte carloPlastic scintillator

In-line MRI-LINAC depth dose measurements using an in-house plastic sc by Levi Madden, Natalia Roberts et al

Abstract Plastic scintillation dosimeters (PSDs) have many properties that make them desirable for relative dosimetry with MRI-LINACs. An in-house PSD, Farmer ionisation chamber and Gafchromic EBT3 film were used to measure central axis percentage depth dose distributions (PDDs) at the Australian MRI-LINAC Mean errors were calculated between each detector s responses, where the in-house PSD was on average within 0.7% of the Farmer chamber and 1.4% of film, while the Farmer chamber and film were on average within 1.1% of each other. However, the PSD systematically over-estimated the dose as depth increased, approaching a maximum overestimation of the order of 3.5% for the smallest field size measured. This trend was statistically insignificant for all other field sizes measured; further investigation is required to determine the source of this effect. The calculated values of mean absolute error are comparable to the those of trusted dosimeters reported in the literature. These mean

Ibre optic dosimeterMri linacPlastic scintillator