Publicação: Two thermal methods to measure the energy fluence of a brief exposure of diagnostic x rays
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This 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.
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diagnostic x ray, energy fluence, imparted energy, photoacoustic, pyroelectric, acoustics, algorithm, dosimeter, human, ionization chamber, priority journal, radiation absorption, radiation beam, radiation energy, radiation exposure, radiation scattering, radiodiagnosis, signal noise ratio, thermal analysis, waveform, X ray, Energy Transfer, Human, Radiation Dosage, Radiography, Support, Non-U.S. Gov't, X-Rays
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Inglês
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Medical Physics, v. 19, n. 3, p. 575-577, 1992.
