Two thermal methods to measure the energy fluence of a brief exposure of diagnostic x rays

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorCarvalho, A. A.
dc.creatorMascarenhas, S.
dc.creatorDePaula, M. H.
dc.creatorCameron, J. R.
dc.date2014-05-27T11:17:28Z
dc.date2016-10-25T18:12:57Z
dc.date2014-05-27T11:17:28Z
dc.date2016-10-25T18:12:57Z
dc.date1992-07-03
dc.date.accessioned2017-04-06T00:44:02Z
dc.date.available2017-04-06T00:44:02Z
dc.identifierMedical Physics, v. 19, n. 3, p. 575-577, 1992.
dc.identifier0094-2405
dc.identifierhttp://hdl.handle.net/11449/64249
dc.identifierhttp://acervodigital.unesp.br/handle/11449/64249
dc.identifier10.1118/1.596912
dc.identifier2-s2.0-0026650632
dc.identifierhttp://dx.doi.org/10.1118/1.596912
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/886150
dc.descriptionThis paper describes two simple thermal methods for measuring the energy fluence in J/cm 2 from a diagnostic x-ray exposure. Both detectors absorb essentially 100% of the radiation and give a signal that is directly proportional to the energy fluence of the x-ray beam. One detector measures the thermal effect when a pulse of x rays is totally absorbed in the pyroelectric detector of lead-zirconium-titanate (PZT). The other detector measures the expansion of a gas surrounding a lead disk detector in a photoacoustic chamber. The increased pressure of the gas is transmitted through a 1-mm duct to a sensitive microphone. Both detectors have previously been used to measure the energy fluence rate of continuous x-ray beams in the same energy region using a chopped beam and a lock-in amplifier. Measurement of the energy fluence of a pulse of radiation eliminates the need for the beam chopper and lock-in amplifier and results in a simple, rugged, and inexpensive dosimeter. Either method can be combined with the area of the beam to give an estimate of the imparted energy to the patient from a diagnostic x-ray exposure.
dc.languageeng
dc.relationMedical Physics
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectdiagnostic x ray
dc.subjectenergy fluence
dc.subjectimparted energy
dc.subjectphotoacoustic
dc.subjectpyroelectric
dc.subjectacoustics
dc.subjectalgorithm
dc.subjectdosimeter
dc.subjecthuman
dc.subjectionization chamber
dc.subjectpriority journal
dc.subjectradiation absorption
dc.subjectradiation beam
dc.subjectradiation energy
dc.subjectradiation exposure
dc.subjectradiation scattering
dc.subjectradiodiagnosis
dc.subjectsignal noise ratio
dc.subjectthermal analysis
dc.subjectwaveform
dc.subjectX ray
dc.subjectEnergy Transfer
dc.subjectHuman
dc.subjectRadiation Dosage
dc.subjectRadiography
dc.subjectSupport, Non-U.S. Gov't
dc.subjectX-Rays
dc.titleTwo thermal methods to measure the energy fluence of a brief exposure of diagnostic x rays
dc.typeOtro


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