Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"plastic scintillators"”.
-
An investigation into surface effects in thin film plastic scintillators
… into the luminescent response of thin film plastic scintillators as a function of their method of preparation is made. Investigations are carried out on NE102A and NE118 using four different methods of preparation. It is found that the Birks model for luminescence as a function of film …
-
Polymerizable dopants capable of high light output and pulse shape discrimination for application in plastic scintillators
Scintillators have long been established for radiation detection and even date back to 1917 in which the use of a scintillator led to the discovery of the proton. Of particular interest are plastic scintillators (PS) which are low cost plastics doped with organic fluorescent compounds. In addition, …
-
Search for Soft Unclustered Energy Patterns at the Large Hadron Collider and studies of radiation damage in plastic scintillators
… thesis presents studies of radiation damage to plastic scintillators, used to produce signals in the CMS calorimeter system, and a search for a beyond-the-Standard-Model particle, the Soft Unclustered Energy Pattern (SUEP). The effects of ionizing radiation on the light output and the optical …
-
Neutron spectrum from 252Cf spontaneous fission
… fragments were detected by means of thin film plastic scintillators in which the scintillation pulse-height response was verified to be a linear function of fragment velocity. The measurements of the neutron spectrum in the restframe of the fragment are compared with previous work and are found …
-
Optimization of plastic scintillator thicknesses for online beta detection in mixed fields
… 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 …
-
Plastic scintillation spectrometry
Plastic scintillators provide homeland security organisations with large area, low cost gamma-ray counters at international borders. Currently these detectors cannot distinguish between the sources they detect, leading to high false alarm rates during primary screening. These alarms must be …
-
An absolute measurement of the photodisintegration of deuterium
… MWPC chambers surrounded by segmented plastic scintillators. The target cylinder is on the axis of the chamber. Particles were collected from 20° to 160°, the angle determined by the charge division technique in the wire chamber. The ~~ measurements in the wire chamber and the …
-
A study of Gamow-teller strength using the 208Pb(p,n) and 181Ta(p,n) reactions at intermediate energy, Ep=122 MeV
… three stacks of four rectangular bars of NE 102A plastic scintillators. The outgoing neutrons were observed at laboratory angles, ΘLab = 0°, 2°, 4° and 10° . A multipole decomposition analysis of spectra associated with ²⁰⁸Pb(p,n)²⁰⁸Bi and ¹⁸¹Ta(p,n)¹⁸¹W reactions was performed using the results …
-
Experimental study of the reaction He3 ([v], [pi+])H3 up to 260 MeV
… The counter telescopes consisted ()f seven plastic scintillators for the pions and four tl'ansmiss10ntype semiconduc1;or detectors for the tritons. Pulses froln the 'semiconductor detectors and the scintillators were displayed on a dual beam oscilloscope -.nd photographed. E and dE/dx …
-
Differential cross sections for the reaction He[superscript 3] ([gamma],[rho]) H[superscript 2] from 45 to 150 MeV
… of three semiconductor detectors followed by a plastic scintillator, actually defined the solid angle. The proton telescope of four plastic scintillators was large enough to intercept all protons correlated with deuterons in the deuteron telescope. Photographs were made of the pulses from the …
-
An innovative portable detector for the live-monitoring of radionuclides in small terrestrial animals
… The optimised design contains two caesium iodide scintillators and two plastic scintillators, which enable the measurement of 137Cs and 90Sr respectively; all four scintillators were shaped and positioned to maximise detection from the organism. Four photomultiplier tubes collect light from the …
-
Algorithms for nuclear data analysis applied to safety and materials
… a PALS experimental setup using organic scintillators and digital electronics. We have designed a digital filter to accurately recover the pulse shape and implemented a constant-fraction discrimination (CFD) timing algorithm to calculate the pulse arrival time. We achieved an excellent …
-
The Design, Synthesis and Characterization of Lanthanide-based Nanomaterials and Their Use in 3D Biological Imaging and Radiation Dosimetry
… bulk lanthanide doped materials and plastic scintillators currently employed.</p><p>In many proposed applications of upconverting nanomaterials, the relative intensities of emission bands are a key component. For instance, security inks rely on measuring the ratio of the green and red …
-
Design of a positron beam for the study of the entanglement in three gamma-rays generated by positronium annihilation
… we are oriented into the use of modules of plastic scintillators originally developed for PET measurements by a group of the Jagiellonian University (Krakow, Poland) [31]. Two modules have been tested with the continuous positron beam from the first part of the apparatus. Just two modules …