Energy spectra of electrons and positrons produced in semi-infinite and infinite water phantoms irradiated by photons with energies up to 1 GeV

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Health Phys.; (United States)

DOI:https://doi.org/10.1097/00004032-198904000-00011· OSTI ID:5980167

Rustgi, M L; Pandey, L N; Kassaee, A; Long, S A

Previous Monte Carlo calculations for the energy spectra of electrons produced in water irradiated by photons are extended to 1 GeV. All of the physical processes believed to be important in the transport of electrons and positrons above 100 keV and photons starting with the ejection of L photoelectrons are considered. The results are presented in tabular form and can be conveniently used to compute kerma in water. The contributions of several physical processes, such as Compton scattering and pair-production to electron spectra, are separately tabulated. The results are compared with those of Todo et al. (1982) for the single interactions of monoenergetic photons. It is found that the inclusion of processes such as multiple Compton scattering, bremsstrahlung production, positron annihilation in flight, Mohiller and Bhabha scattering from electrons and Moliere multiple scattering from atomic nuclei make a considerable difference in the inferred electron spectrum in water.

• Research Organization: State Univ. of New York, Buffalo (USA)
• OSTI ID: 5980167
• Journal Information: Health Phys.; (United States), Journal Name: Health Phys.; (United States) Vol. 56:4; ISSN HLTPA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
FERMIONS
KERMA
LEPTONS
MASSLESS PARTICLES
MOCKUP
MONTE CARLO METHOD
PHANTOMS
PHOTONS
POSITRONS
RADIATIONS
SCATTERING
SPECTRA
STRUCTURAL MODELS