Optimization of plastic scintillator thicknesses for online beta/gamma detection

Abstract

For efficient beta detection in a mixed beta gamma field, Monte Carlo simulation models have been built to optimize the thickness of a plastic scintillator, used in a whole body monitor. The simulation has been performed using the MCNP/X code for different thicknesses of plastic scintillator from 150 μm to 600 μm. The relationship between the thickness of the scintillator and the efficiency of the detector has been analyzed. For 150 μm thickness, an experimental investigation has been conducted with different beta sources at different positions on the scintillator and the counting efficiency of the unit has been measured. Evaluated data along with experimental ones have been discussed. A thickness of 300 μm to 500 μm has been found to be the optimum thickness for high efficiency beta detection in the presence of low energy gamma-rays.

Technical note: Assessment of radiation measurement devices for the detection of [177Lu]Lu‐labeled radiopharmaceuticals containing [177mLu]Lu‐impurities

“…For the calibration of the contamination monitor, a homogeneous extended source was used, whereas for validation, small point‐shaped contaminations on wipe pads were measured. Measurements can be affected by geometric efficiency (e.g., radiation source in the center of the detector or at the detector edge) and by inhomogeneities in the sensitivity of the detector (e.g., scintillator material 17 and readout of the scintillation signal by a single photomultiplier). With respect to these limitations, using a point source for validation is an imperfect validation scenario.…”

РОЗРОБКА ТА ВИГОТОВЛЕННЯ ДЕТЕКТОРІВ ТИПУ СЦИНТИЛЯТОР-ФЕП НА ОСНОВІ ZnSe(Al) ТА ПЛАСТМАСОВОГО СЦИНТИЛЯТОРУ UPS-923A ДЛЯ ПРИЛАДІВ РЕЄСТРАЦІЇ α-, β- ТА ЗМІШАНИХ α-β-ВИПРОМІНЕНЬ

“…To solve the problem of registration of β-radiation in the γ-background field, the most suitable device is a detector based on a thin plastic scintillator [19]. It has been shown in [28] that the opti- mal thickness of the scintillator for effective registration of β-particles is 0.2 mm.…”

“…Ionization chambers, scintillation counters with organic crystals (anthracene, stilbene, scintillation plastic based on polystyrene) [17][18][19][20], Geiger-Muller counters are used as detectors for registration of β-particles. Today, the plastic scintillators are the most promising for β-particle detectors due to their low density and low effective atomic number, which reduces sensitivity to gam ma (γ) radiation.…”

Low Energy Beta Emitter Measurement: A Review

“…The organic scintillator is an aromatic hydrocarbon compound and has a benzene-ring structure [59]. Organic scintillators are classified into organic crystals, plastics, liquid scintillators, etc., depending on their densities [60].…”