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.
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Showing 1 to 20 of 23 for “"Ionization Chamber"”.
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An ionization chamber for fission fragment analysis
… a collaborator, we are building and testing an ionization chamber to be used for the SPIDER project which will ultimately take place at the LANSCE facility at Los Alamos National Laboratory. A full spectrum of the pertinent variables dictating the functionality of the ionization chamber have …
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Ionization Chamber Design, Development, and Testing for the UNM Fission Fragment Spectrometer
… data from a time-of-flight detector and an ionization chamber energy detector. Our UNM spectrometer will also be capable of gathering fission fragment charge (Z) data, due to the addition of an active cathode in the ionization chamber. Preliminary testing has already taken place at the …
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The design and operation of a differential ionization chamber system for halflife measurements
Call number: LD2668 .T4 1955 S67
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The design and operation of a differential ionization chamber system for halflife measurements
Call number: LD2668 .T4 1955 S67
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Dielectric liquid ionization chambers for detecting fast neutrons
Three ionization chambers with different geometries have been constructed and filled with dielectric liquids for detection of fast neutrons. The three dielectric liquids studied were Tetramethylsilane (TMS), Tetramethylpentane (TMP), and Isooctane, which each have intrinsic properties that make …
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Conceptual Development of Remote Monitoring System for Pressurized Water Reactor Spent Fuel Dry Cask Storage Through Neutron and Gamma Transport Simulations
… design of the RMS included two fission chambers (to detect neutrons) and one ionization chamber (to detect gamma radiation) enclosed in a polyethylene box with a thin cadmium plate inside, so the sequence of layers starting from the MPC lid was: polyethylene bottom layer, cadmium plate, …
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A determination of the effective thickness of a liquid deuterium target for a quasielastic scattering experiment
… of incident neutrons was determined by a fission ionization chamber. The scattered deuterons were detected with a Delta E - E (thin plastic scintillator - thick CsI calorimeter) telescope. The effective target thickness was determined to be larger than is thought physically possible. Possible …
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Yield, Kinetic Energy, Pairing Effect, and Shell Effect of Light Fission Products for Thermal-Neutron Fission of Uranium-233
… in conjunction with a thin-windowed gridded ionization chamber to determine the yields of light fission products for thermal-neutron fission of U-233. HIAWATHA has an energy resolution of 0.3%, a mass resolution of 0.5 amu, and an atomic-number resolving power of 38. The yields were measured …
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Dosimetric characterization of a miniature x-ray source for biophysics studies
… radiochromic film and Standard Imaging’s A-20 ionization chamber. To safely carry out the characterization experiments a dual layered safety shielding was constructed and parameters including beam dimensions, air-kerma and dose to tissue values from the Mini-X were explored. Lastly, a cross …
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Experimental and theoretical investigations of molecular ions by spectroscopy as well as ion mobility and mass spectrometry
… of this thesis was the elucidation of different ionization methods (resonance-enhanced multiphoton ionization – REMPI, electrospray ionization – ESI, atmospheric pressure chemical ionization – APCI) in ion mobility (IM) spectrometry. In order to gain a better understanding of the ionization …
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Monte Carlo simulations for heavy ion dosimetry
… stopping power ratio ( ) calculations for the ionization chamber dosimetry of clinically relevant ion beams with initial energies from 50 to 450 MeV/u have been performed using the Monte Carlo technique. To simulate the transport of a particle in water the computer code SHIELD-HIT v2 was used …
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An Electrometer Design and Characterization for a CubeSat Neutral Pressure Instrument
… neutral gas pressure. SNeuPI consists of an ionization chamber and a logarithmic electrometer circuit. The Rev. 1 SNeuPI electrometer prototype does not function as designed. A Rev. 2 electrometer circuit must be designed and its performance characterized across specified operating …
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Beam characterization for accelerator-based boron neutron capture therapy using the ⁹Be(d,n) nuclear reaction
… Dosimetry results were obtained using the dual ionization chamber technique coupled with bare and cadmium-covered gold foils. Data have been taken with deuteron beams of 1.3 MeV to 1.8 MeV. As deuteron energy was increased, the tumor dose rate correspondingly improved due to the neutron yield …
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Long-term variation in cosmic-ray modulation
… potentials between 1936 and 2009 using the ionization chamber an neutron monitor data. The normalized difference between the calculate modulation potentials by Usoskin et al. (2005) and Usoskin et al. (2011 is 3.4 % for solar maximum in June 1991. According to Usoskin et al (2011), their …
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Penumbral Distributions For High-energy Radiotherapy Photon Beams: Experimental And Theoretical Determinations
… of interaction.;Specially-designed cylindrical ionization chambers of varying inside diameters were used to determine the primary penumbral dose distributions in media of varying electron density for Co-60, 6- and 31-MV x-ray beams. The results indicate that the measured penumbral dose …
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Fission fragment mass distributions and total kinetic energy release of 235-uranium and 238-uranium in neutron-induced fission at intermediate and fast neutron energies LA-UR-15-28829
… experiments such as the Time Projection Chamber (TPC) for fission cross section measurements and the Spectrometer for Ion Determination in Fission (SPIDER) for precision mass yields. The dissertation discusses the motivations and underlying theory behind the study of fission. It also …
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Fission fragment mass distributions and total kinetic energy release of 235-uranium and 238-uranium in neutron-induced fission at intermediate and fast neutron energies LA-UR-15-28829
… experiments such as the Time Projection Chamber (TPC) for fission cross section measurements and the Spectrometer for Ion Determination in Fission (SPIDER) for precision mass yields. The dissertation discusses the motivations and underlying theory behind the study of fission. It also …
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Metrologia dei campi di radiazioni di bassa energia
… with the values measured using an a free-air ionization chamber. For each radiation quality, the spectrum was characterized by the parameters given in ISO 4037-1. The conversion coefficients from the air kerma to the ICRU operational quantities Hp(10), Hp(0.07), H’(0.07) and H*(10) were …
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Evaluation of Presage® As A 3D Dose Verification to ol In Proton Beams
… treatment plan verification are film, TLD, and ionization chambers. Such 0D and 2D dosimeters are incapable of fully registering a complete dose volume. This shortcoming has led to an interest in a robust 3D dosimeter with dosimetric accuracy matching that of traditional devices. PRESAGE®, a …
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