Abstract
A thin plate of a plastic scintillator for detecting a beta-ray was developed. The plastic scintillator was made using epoxy resin and organic scintillators such as 2.5-diphenyloxazole (PPO) and 1,4-bis [5-phenyl-2-oxazole] benzene (POPOP). The mixture ratio of epoxy resin and the organic scintillators was determined using their absorbance, transmittance, emission spectra, and transparency. Their optimal weight percentage of PPO and POPOP in the organic scintillators was adjusted to 0.2 wt%:0.01 wt%. The prepared plastic scintillator was used to measure the standard source of Sr-90. The pulse height spectra and total counts of the prepared plastic scintillator were similar to a commercial plastic scintillator. Based on the above results, a large-area plastic scintillator was prepared for rapid investigation of a site contaminated with Sr-90. The prepared large-area plastic scintillator was evaluated for the characteristics in the laboratory. The evaluation results are expected to be usefully utilized in the development of a large-area plastic scintillation detector. The large-area plastic scintillation detector developed on the basis of the evaluation results is expected to be utilized to quickly measure the contamination of Sr-90 in the grounds used as a nuclear power facility.
Highlights
The methods for detecting radiation are ionization, excitation, scintillation, extinction and a chemical reaction [1]
We investigated the properties such as the absorbance, transmittance, emission spectra, and transparency of the prepared plastic scintillator
We could see the transparency of the plastic scintillator by adding the least amount of p-terphenyl or 2.5-diphenyloxazole (PPO) and POPOP
Summary
The methods for detecting radiation are ionization, excitation, scintillation, extinction and a chemical reaction [1]. Radiation detection using scintillator light produced in a material is one of the oldest and most useful techniques for the detection of a variety of radiation [2, 3]. Scintillation detectors are widely used for radiation measurements in nuclear and high-energy physics. New applications in the medical field were recently found [4-6]. A detector using plastic scintillators is well known to have an easy operation because it consists of a chemically stable material [7]. Several studies have been conducted to include the features, such as neutron radiation hardness [8] and sensitivity [9-11], as well as reduced manufacturing costs [12, 13]. A large-area plastic scintillator of an affordable price has been required by many researchers of nuclear and high-energy physics fields [14-17]
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