A Bf3 Fast Neutron Dosimeter (Long Counter)

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dc.contributor.authorLeyland, Walter A.en
dc.contributor.departmentPhysicsen
dc.date.accessioned2014-03-14T21:34:51Zen
dc.date.adate2010-04-26en
dc.date.available2014-03-14T21:34:51Zen
dc.date.issued1960-09-03en
dc.date.rdate2010-04-26en
dc.date.sdate2010-04-26en
dc.description.abstractA BF3 fast neutron dosimeter or long counter is constructed and calibrated for use with the Cockcroft-Walton accelerator and UTR-IO reactor at Virginia Polytechnic Institute. The counter consists of a paraffin cylinder 8 inches in diameter, having a BF3 proportional detector on the axis and a set of holes around the detector to improve the low energy response. External shields of paraffin, 3 inches thick, and boron-trioxide, 1/2 inch thick, enclose the paraffin cylinder. These shields serve to reduce the background effect and improve the high energy response. Calibration of the counter is accomplished using as neutron sources: plutonium-berylliwn and the induced reactions H2(d,n)He3 and H3(d,n)He4. Long counter efficiencies for both a 1 inch and 1/2 inch BF) tube yield a flat response over the energy range, 2.5 to 4 Mev whereas an approximately 60% decrease in efficiency is observed for a 14.1 Mev neutron. Count rate of long counter is expressed as a function of the incident neutron flux. Neutron fluxes, ranging from 0 to 1100 neutrons/cm2-second are monitored with the counter.en
dc.description.degreeMaster of Scienceen
dc.format.extent51 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-04262010-020346en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04262010-020346/en
dc.identifier.urihttp://hdl.handle.net/10919/42283en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1960.L495.pdfen
dc.relation.isformatofOCLC# 27251505en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1960.L495en
dc.subject.lcshDosimetersen
dc.titleA Bf3 Fast Neutron Dosimeter (Long Counter)en
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplinePhysicsen
thesis.degree.grantorVirginia Polytechnic Instituteen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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