Measurement of bremsstrahlung spectra from 25 MeV electrons on Ta as a function of radiator thickness and emission angle

Lambert, Rob; Jury, J. W.; Sherman, N. K.

doi:10.1016/0167-5087(83)90602-6

Cited by 15 publications

(2 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There have been various experimental methods used to derive such spectra. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] However, the Monte Carlo method remains the most comprehensive and potentially the most accurate method of obtaining such spectra. Almost two decades ago, Mohan et al 20 provided a series of megavoltage photon beam spectra for various energies of the Varian linacs using the Monte Carlo technique.…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code

2002

View full text Add to dashboard Cite

A recent paper analyzed the sensitivity to various simulation parameters of the Monte Carlo simulations of nine beams from three major manufacturers of commercial medical linear accelerators, ranging in energy from 4-25 MV. In this work the nine models are used: to calculate photon energy spectra and average energy distributions and compare them to those published by Mohan et al. [Med. Phys. 12, 592-597 (1985)]; to separate the spectra into primary and scatter components from the primary collimator, the flattening filter and the adjustable collimators; and to calculate the contaminant-electron fluence spectra and the electron contribution to the depth-dose curves. Notwithstanding the better precision of the calculated spectra, they are similar to those calculated by Mohan et al. The three photon spectra at 6 MV from the machines of three different manufacturers show differences in their shapes as well as in the efficiency of bremsstrahlung production in the corresponding target and filter combinations. The contribution of direct photons to the photon energy fluence in a 10 x 10 field varies between 92% and 97%, where the primary collimator contributes between 0.6% and 3.4% and the flattening filter contributes between 0.6% and 4.5% to the head-scatter energy fluence. The fluence of the contaminant electrons at 100 cm varies between 5 x 10(-9) and 2.4 x 10(-7) cm(-2) per incident electron on target, and the corresponding spectrum for each beam is relatively invariant inside a 10 x 10 cm2 field. On the surface the dose from electron contamination varies between 5.7% and 11% of maximum dose and, at the depth of maximum dose, between 0.16% and 2.5% of maximum dose. The photon component of the percentage depth-dose at 10 cm depth is compared with the general formula provided by AAPM's task group 51 and confirms the claimed accuracy of 2%.

show abstract

Section: Introductionmentioning

confidence: 99%

Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code

2002

View full text Add to dashboard Cite

show abstract

“…There were several experiments in which the energy spectra of bremsstrahlung photons at 0 degree were measured. [4][5][6][7][8][9][10] For example, O'Dell et al measured the energy spectra systematically at 0 degree from a tungsten-gold target bombarded by 5.3-20.9 MeV electrons. 6) The absolute values of energy spectra have some differences between measured and calculated results.…”

Section: Introductionmentioning

confidence: 99%

Angular Distribution of Bremsstrahlung from Copper and Tungsten Targets Bombarded by 18, 28, and 38MeV Electrons

Kosako

Oishi

Nakamura

et al. 2010

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

We measured the angular distribution of bremsstrahlung photons between 0 and 120 degrees from copper and tungsten targets bombarded by 18, 28, and 38 MeV electrons at the electron linac of Hokkaido University. Activation detectors and two types of dosimeters were applied for the measurement. The measured results were compared with those calculated with the Monte Carlo code MCNP5 to verify the calculated results. The calculated results of both the reaction rates and ambient dose equivalent rates gave good agreement with the measured ones in the case of 18 MeV electrons. A good agreement between the measurement and calculation was also observed for relative angular distributions of dose rates from 38 MeV electrons; however, the calculation overestimated the measured data by a factor of 1.2 to 2.0. To achieve further accuracy of calculation, improvement of photonuclear reaction data and absorbed dose measurement are necessary for bremsstrahlung radiation dosimetry.

show abstract

Measurements of Bremsstrahlung Spectra from 50 MeV Electrons on Ta and Photoneutrons Energy Distribution from Light, Medium and Heavy Nuclei

Zavyalov¹,

In’kov²,

Dudorov³

et al. 1992

Nuclear Data for Science and Technology

View full text Add to dashboard Cite

Measurement of bremsstrahlung spectra from 25 MeV electrons on Ta as a function of radiator thickness and emission angle

Cited by 15 publications

References 20 publications

Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code

Monte Carlo calculation of nine megavoltage photon beam spectra using the BEAM code

Angular Distribution of Bremsstrahlung from Copper and Tungsten Targets Bombarded by 18, 28, and 38MeV Electrons

Measurements of Bremsstrahlung Spectra from 50 MeV Electrons on Ta and Photoneutrons Energy Distribution from Light, Medium and Heavy Nuclei

Contact Info

Product

Resources

About