Dosimetry intercomparisons between fast-neutron radiotherapy facilities
Neutron dosimetry intercomparison visits have been made by physicists from the M. D. Anderson Hospital–Texas A&M University Project to the Naval Research Laboratory, the University of Washing...
Neutron dosimetry intercomparison visits have been made by physicists from the M. D. Anderson Hospital–Texas A&M University Project to the Naval Research Laboratory, the University of Washing...
Experimental test of a new method for kVp measurements
We present the results of an experimental test of a new method for measuring the kVp of a diagnostic x-ray beam. The method involves measuring x-ray attenuation in copper or tin absorbers and plotting...
We present the results of an experimental test of a new method for measuring the kVp of a diagnostic x-ray beam. The method involves measuring x-ray attenuation in copper or tin absorbers and plotting...
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Mathematical method for determining kVp from x-ray attenuation measurements
Med. Phys. Volume 2, Issue 4, pp. 201-207 (July 1975)
Issue Date: July 1975
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BibSonomy
KEYWORDS and PACS
PHOTON TRANSPORT,
COPPER,
ABSORPTION,
X RADIATION,
ENERGY,
LIMITING VALUES,
BREMSSTRAHLUNG,
ATTENUATION
- 87.70.Es
Biophysics, medical physics, and biomedical engineering Biomedical engineering Diagnostic methods and instrumentation - 87.60.Gp
Biophysics, medical physics, and biomedical engineering Medical and biomedical uses of fields, radiations, and radioactivity Laser beams, microwaves, and other electromagnetic waves - YEAR: 1983
PUBLICATION DATA
0094-2405 (print)
AAPM
A mathematical analysis of the shape of x-ray attenuation curves is presented that suggests a new method of determining the kVp of bremsstrahlung beams. The main result is a simple analytic formula which gives an excellent approximation to the attenuation curve for large thickness of high-Z absorber. From this, a graphical procedure is derived which yields a straight line whose slope is related to the mass attenuation coefficient evaluated at the peak energy. Included are corrections for aluminum filtration, ion-chamber energy dependence, and coherent scattering. The method is limited to beams generated by a constant potential and with negligible characteristic photons in the filtered spectrum. Numerical data are given for using copper absorber below 70 kVcp and tin above 90 kVcp.
| History: | Received 6 November 1974 |
| Permalink: | http://dx.doi.org/10.1118/1.594179 |
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