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Optimization of Plastic Scintillator Thicknesses for Online Beta Detection in Mixed Fields

Optimization of Plastic Scintillator Thicknesses for Online Beta Detection in Mixed Fields
Author: Khadijeh Pourtangestani
Publisher:
Total Pages: 0
Release: 2010
Genre:
ISBN:

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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 whole body monitor. The simulation has been performed using MCNP/X code and different thicknesses of plastic scintillators ranging from 150 to 600 um have been used. The relationship between the thickness of the scintillator and the efficiency of the detector has been analyzed. For 150 m 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 um to 500 um has been found to be an optimum thickness for better beta detection efficiency in the presence of low energy gamma ray.


Applications of Liquid Scintillation Counting

Applications of Liquid Scintillation Counting
Author: Donald L. Horrocks
Publisher:
Total Pages: 376
Release: 1974
Genre: Science
ISBN:

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Applications of Liquid Scintillation Counting ...


Liquid Scintillator Beta Counting of Iron-59 in Clear and Colored Systems

Liquid Scintillator Beta Counting of Iron-59 in Clear and Colored Systems
Author: Thomas P. Leffingwell
Publisher:
Total Pages: 10
Release: 1960
Genre: Beta decay
ISBN:

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National Bureau of Standards iron-59-chloride was employed in model systems to quantitate liquid scintillator beta counting of iron-59. In systems which contain a colored iron-ortho-phenanthroline chelate, decline in counting efficiency is a linear function of color density for the concentration gradient investigated. However, presence of the colored chelate causes an increased photon yield relative to the corresponding visibility colorless sample. The enhanced photo yield elevates the entire coincidence counting efficiency curve by approximately 6 percent. The enhancement phenomenon is (1) chelate concentration dependent, (2) beta particle energy dependent, (3) at its maximum at the emission peak of the scintillators in the counting system employed, (4) effected only in the presence of the scintillators, and (5) gamma ray independent.


Plastic Scintillators

Plastic Scintillators
Author: Matthieu Hamel
Publisher: Springer Nature
Total Pages: 647
Release: 2021-07-10
Genre: Science
ISBN: 3030734889

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This book introduces the physics and chemistry of plastic scintillators (fluorescent polymers) that are able to emit light when exposed to ionizing radiation, discussing their chemical modification in the early 1950s and 1960s, as well as the renewed upsurge in interest in the 21st century. The book presents contributions from various researchers on broad aspects of plastic scintillators, from physics, chemistry, materials science and applications, covering topics such as the chemical nature of the polymer and/or the fluorophores, modification of the photophysical properties (decay time, emission wavelength) and loading of additives to make the material more sensitive to, e.g., fast neutrons, thermal neutrons or gamma rays. It also describes the benefits of recent technological advances for plastic scintillators, such as nanomaterials and quantum dots, which allow features that were previously not achievable with regular organic molecules or organometallics.