Otro
Two thermal methods to measure the energy fluence of a brief exposure of diagnostic x rays
Registro en:
Medical Physics, v. 19, n. 3, p. 575-577, 1992.
0094-2405
10.1118/1.596912
2-s2.0-0026650632
Autor
Carvalho, A. A.
Mascarenhas, S.
DePaula, M. H.
Cameron, J. R.
Resumen
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.
Materias
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Two thermal methods to measure the energy fluence of a brief exposure of diagnostic x rays
Universidade Estadual Paulista (Unesp) (1992-07-03)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 ... -
Two thermal methods to measure the energy fluence of a brief exposure of diagnostic x rays
Universidade Estadual Paulista (Unesp) (1992-07-03)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 ...