Microdosimetry of the pion beam at TRIUMF
- Tokyo Univ., Japan
Microdosimetry of a pion beam was carried out at the biomedical pion channel at TRIUMF. Event size spectra were measured at 17 depths in a water phantom along the axis of a pion beam which had a midline momentum of 180 MeV/c. Measurements were performed with a spherical tissue equivalent plastic proportional counter. The pulses were processed with a 4.5 decade logarithmic amplifier which made the recording and analysis quite simple. Measurements were made off the axis and with various effective diameters. A novel time-of-flight microdosimetry technique was employed to differentiate the contributions of the pions and contaminant muons and electrons to the total spectrum. The fractional dose contributions for different lineal energy intervals, the frequency mean lineal energy (anti y/sub F/), and the dose mean lineal energy (anti y/sub D/) were calculated as a function of depth in the phantom. A marked change in the radiation quality was measured between the plateau region, where most of the energy is deposited by passing particles, and the peak region, where a significant amount of energy is deposited by the star products from pion capture. Finally, a map of the varying radiation quality of the pion beam is presented and discussed in relation to other radiation types.
- OSTI ID:
- 5130071
- Journal Information:
- Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 82:3; ISSN RAREA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
61 RADIATION PROTECTION AND DOSIMETRY
62 RADIOLOGY AND NUCLEAR MEDICINE
655003 -- Medical Physics-- Dosimetry
ACCELERATORS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BOSONS
CYCLIC ACCELERATORS
CYCLOTRONS
DATA
DEPTH DOSE DISTRIBUTIONS
DOSIMETRY
ELEMENTARY PARTICLES
ENERGY TRANSFER
EXPERIMENTAL DATA
HADRONS
INFORMATION
ISOCHRONOUS CYCLOTRONS
LET
MEASURING INSTRUMENTS
MEDICINE
MESONS
MICRODOSIMETRY
MOCKUP
NUCLEAR MEDICINE
NUMERICAL DATA
PHANTOMS
PIONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RADIATION DOSE DISTRIBUTIONS
RADIATION EFFECTS
RADIATION QUALITY
RADIOLOGY
RADIOTHERAPY
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
THERAPY
TISSUE-EQUIVALENT DETECTORS
TRIUMF CYCLOTRON