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Showing 1 to 20 of 29 for “"Proportional counter"”.
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Hot particle dosimetry using a wall-less tissue equivalent proportional counter
… a custom fabricated wall-less tissue equivalent proportional counter and a mechanism for increasing the beta or alpha particle source to counter distance by distances equivalent to tens of micrometers of unit density tissue. Monte Carlo computational models of the experimental apparatus were also …
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The Correlation Between Electrical Pulses and Light Flashes in a Proportional Counter.
A proportional counter is a device used to measure the energy spectra of charged particles and photons. The charged particle ionizes the gas molecules along its path. In the presence of a strong electric field, the electrons and ions are swept toward the collecting electrodes. The electric field …
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Design, Construction, and Calibration of a Proton Recoil Proportional Counter for Neutron Spectrum Measurements
Made available in DSpace on 2017-07-06T18:55:22Z (GMT). No. of bitstreams: 2 Mertogul_Remzi_MS.pdf: 40599039 bytes, checksum: e62ff031c4bb21e0db562a5c64ed9490 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1979
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Theoretical performance analysis of a novel hemispherical tissue equivalent proportional counter for neutron monitoring and dosimetry
… It has been demonstrated that Tissue Equivalent Proportional Counters (TEPCs) have the potential to improve the accuracy of neutron dosimetry in these reactor fields, and Multi-Element Tissue Equivalent Proportional Counters (METEPCs) could reduce the size of instrumentation required to do so. …
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The effect of high dose rate on tissue equivalent proportional counter measurements in mixed neutron-gamma fields
Tissue equivalent proportional counters (TEPCs) are commonly used for radiation monitoring in areas where a mixture of neutron and photon radiations may be present, such as those commonly encountered in nuclear power plants. In such radiation fields, the dose rate of each component can vary …
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An Analysis of the 3-He Proportional Counter Data from the Sudbury Neutrino Observatory Using Pulse Shape Discrimination
… analysis of the data from 3-He-filled proportional counters from the third phase of the Sudbury Neutrino Observatory (SNO) data. These counters were deployed in SNO's heavy water to independently detect neutrons produced by the neutral current interaction of 8-B solar neutrinos with …
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The measurement of gamma ray-induced heating in a mixed neutron and gamma ray environment
… were made in the mid-line of the lattice using a proportional counter operating in the Continuously-varied Bias-voltage Acquisition (CBA) mode. The neutron-induced signal was separated from the gamma-induced signal by exploiting the signal rise-time differences inherent to radiations of different …
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Long wavelength X-ray microanalysis
… of x-ray spectrometr.v are impracticable. The proportional counter, the best of several possibilities, has there~ore been employed as a dispersive detector, the output pulses subsequently being fu"'1.alysed electronically to yield the necessar.v line intensity information. Proportional counter …
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A measurement of the diffraction scattering of pions and protons from complex nuclei using multiwire proportional counters
… with the development and testing of mu1tiwire proportional counters. The second part involves the use of a proportional counter system in an experiment to study the diffraction scattering of protons and positive pions from various complex nuclei. A good precision experiment is made considerably …
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X-ray power density spectra of black hole binaries : a new deadtime model for the RXTE PCA
… X-ray detectors. In this work, we focus on the Proportional Counter Array (PCA) instrument of the Rossi X-ray Timing Explorer (RXTE), an orbiting observatory that offers fast, microsecond-level time resolution and modest spectral resolution for celestial X-ray sources. We derive a new model for …
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High-Precision Half-Life Measurement of Oxygen-14
… of 14O was deduced using a 4π gas-filled proportional counter and fast tape transport system. The lightest superallowed emitters like 14O is important to probe for the non-zero scalar contributions to the nuclearβdecay. This analysis has led to a new half-life value T1/2(14O) =70627(10) ms …
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A study of the long-term behavior of galactic X-ray sources with RXTE
… (ASM), and pointed observations made with the Proportional Counter Array (PCA) on board the Rossi X-ray Timing Explorer (RXTE). I have conducted a systematic search through the ASM data of all the 300 X-ray sources monitored for evidence of periodic behavior. Follow-up investigations are …
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X-ray diffraction study of aged copper beryllium alloys
… 315°C are collected using a position sensitive proportional counter with eu 1(0:1 radiation. The hardness values of the samples are also measured. An elastic model for the coherent precipitates in anisotrpic matrix is developed according to Eshelby's treatment of transformed regions in an …
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Investigation and use of dual (twin) low pressure proportional counters for active neutron-gamma mixed field dosimetry
… dose-rate measurements. Tissue equivalent proportional counters (TEPCs) have been used, but their accuracy is limited. In this study, a custom-built Cylindrical Graphite Proportional Counter (Cy-GPC) along with a twin Cylindrical TEPC (Cy-TEPC) has been extensively investigated for n-γ …
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The Nature and Origin of Large Scale Diffuse X -Ray Emission in the Large Magellanic Cloud
… (LMC) taken with the ROSAT Position Sensitive Proportional Counter (PSPC) have revealed extensive diffuse X-ray emission, indicative of hot ≳ 106 K gas associated with this irregular galaxy on scales from ∼10 pc to ≥1000 pc. Here we examine the nature and origin of the large scale …
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A measurement of the neutron diffusion parameters of water at different temperatures by the pulsed method
… one surface of the sample were counted in a BF₃ proportional counter. The time distribution of these neutrons was recorded by an eighteen channel time analyzer. The width of each channel was 20 microseconds. The opening of the first channel was delayed 100 microseconds with respect to the start …
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Developing a method to sample potential resuspension of radioactive contaminants near the former Rocky Flats Technical Plant
… radiological analysis with a Mirion LB4200 gas proportional counter. Significant imperfections of a printed prototype indicate that a stage-to-stage comparison between a commercial and a 3D-printed cascade impactor cannot be justified. Additionally, it is unlikely that current technology is …
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