Simulation studies of 4-MV x-ray spectral reconstruction by numerical analysis of transmission data

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · Med. Phys.; (United States)

DOI:https://doi.org/10.1118/1.595131· OSTI ID:6688069

Huang, P; Kase, K R; Bjaerngard, B E

The use of transmission measurements with combinations of attenuating materials has been investigated as a method of determining the x-ray energy spectrum from a 4-MV linear accelerator. Simulation studies have been made with three 4-MV x-ray spectra of slightly different shapes. From each of these spectra, the narrow beam transmission curve was calculated, using lead to attenuate the beam for the first several points. Aluminum was then added to attenuate the beam to 0.001 of its initial intensity. A computer program using an iterative least-squares technique has been developed to analyze the transmission data and determine the spectrum by applying some physically reasonable sensible constraints. The calculated transmission values agreed with the simulated data within the estimated experimental uncertainties, and it is concluded that the technique is reliable for the spectral reconstruction and is sensitive to small spectral changes.

• Research Organization: Joint Center for Radiation Therapy and Department of Radiation Therapy, Harvard Medical School, Boston, Massachusetts 02115
• OSTI ID: 6688069
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 9:5; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

654001* -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ALUMINIUM
ATTENUATION
ELECTROMAGNETIC RADIATION
ELEMENTS
ERRORS
IONIZING RADIATIONS
ITERATIVE METHODS
LEAD
LINEAR ACCELERATORS
METALS
NEUTRAL-PARTICLE TRANSPORT
PHOTON TRANSPORT
RADIATION TRANSPORT
RADIATIONS
SENSITIVITY
SIMULATION
SPECTRA
TRANSMISSION
X RADIATION
X-RAY SPECTRA