X-ray or gamma ray systems or devices – Accessory – Testing or calibration
Patent
1989-06-14
1990-04-10
Church, Craig E.
X-ray or gamma ray systems or devices
Accessory
Testing or calibration
378 98, G01D 1800
Patent
active
049167278
ABSTRACT:
Apparatus is provided for use in detecting the input voltage applied to a radiation source operating at an unknown voltage within a given voltage range. The apparatus includes a set of radiation absorbing filters including a first filter which includes a first chemical element and a second filter which includes a second chemical element. These elements are chosen so that the filters exhibit different radiation absorption characteristics within the given voltage range. The filters are adapted to be positioned so that the first and second filters are irradiated by the radiation source with the radiation impinging upon a surface of each filter and partially absorbed thereby as it passes therethrough so as to exit therefrom as attenuated radiation. A detector receives the attenuated radiation passed by the first and second filters and provides first and second signals having magnitudes which vary with the attenuated radiation respectively passed by the first and second filters. A ratio is determined as to the magnitude of the first signal to that of the second signal with the magnitude of the ratio varying with that of the input voltage. At least one of the first and second elements exhibits a known K absorption edge within the given voltage range. Consequently as the input voltage is increased to exceed the known K absorption edge that chemical element exhibits a greater attenuation characteristic to extend the useful range of the relationship of the magnitude of the ratio and the input voltage.
REFERENCES:
patent: 3766383 (1973-10-01), Harris et al.
patent: 4361900 (1982-11-01), Siedband
patent: 4697280 (1987-09-01), Zarnstorff et al.
Devices for Measuring Peak Kilovoltage of Diagnostic X-Ray Equipment, with Emphasis on Noninvasive Electronic Meters, by Martha E. Harshbarger-Kelly, vol. 1, No. 1, 1985 Health Care Instrumentation.
Keithley Instruments advertising brochure, "The Non-Invasive Advantage", Model 35080 kVp Divider.
Radiation Probe for Indirect Evaluation of the High-Voltage Waveform of a Mo Anode Mammography Unit, by M. Gambaccini, M. Marziani, and O. Rimondi, from Medical Physics, vol. 16, No. 1, Jan./Feb. 1989.
Church Craig E.
Keithley Instruments Inc.
LandOfFree
Apparatus for measuring the voltage applied to a radiation sourc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for measuring the voltage applied to a radiation sourc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for measuring the voltage applied to a radiation sourc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2305217