Neutron and gamma spectroscopy for clinical dosimetry

Journal Article · Mon Sep 01 00:00:00 EDT 1980 · Med. Phys.; (United States)

DOI:https://doi.org/10.1118/1.594744· OSTI ID:6998922

Schmidt, R; Magiera, E; Scobel, W

Neutron and photon energy spectra were measured in different depths and lateral positions in tissue-equivalent phantoms exposed to a therapeutical 14.1 MeV neutron beam. Intensity weighted mass energy absorption coefficients were derived for application in ionization chamber dosimetry in mixed neutron-gamma fields. The resulting relative depth doses show that on the beam axis for depths in excess of 20 cm, gamma radiation contributes with more than 10% to the total dose; off the axis outside the direct beam neutron and gamma doses are comparable. The differences between these doses and those neglecting the spectral distribution increase with depth and with the distance from the beam axis.

• Research Organization: Radiologische Klinik des Universitaetskrankenhauses Hamburg--Eppendorf, D2000 Hamburg 20, Federal Republic of Germany
• OSTI ID: 6998922
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 7:5; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
CHARGED-PARTICLE REACTIONS
DEPTH DOSE DISTRIBUTIONS
DEUTERON REACTIONS
DIRECT REACTIONS
DOSIMETRY
ENERGY RANGE
EVEN-EVEN NUCLEI
GAMMA DOSIMETRY
GAMMA SPECTRA
HELIUM 4
HELIUM ISOTOPES
IONIZATION CHAMBERS
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
MEDICINE
MEV RANGE
MEV RANGE 10-100
MOCKUP
NEUTRON DOSIMETRY
NEUTRON SPECTRA
NEUTRON THERAPY
NUCLEAR MEDICINE
NUCLEAR REACTIONS
NUCLEI
PHANTOMS
RADIATION DETECTORS
RADIATION DOSE DISTRIBUTIONS
RADIOLOGY
RADIOTHERAPY
SPATIAL DOSE DISTRIBUTIONS
SPECTRA
STABLE ISOTOPES
STRIPPING
STRUCTURAL MODELS
TARGETS
THERAPY
TRANSFER REACTIONS
TRITIUM TARGET