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Pulsed system for obtaining microdosimetric data with high intensity beams

Conference ·
; ;
The use of heavy particle accelerators for radiation therapy requires high intensity beams in order to produce useful dose rates. The 800-MeV proton beam at LAMPF passes through different production targets to generate secondary pion beams. Conventional microdosimetric techniques are not applicable under these conditions because exceedingly high count rates result in detector damage, gas breakdown, and saturation effects in the electronics. We describe a new microdosimetric system developed at the Pion Biomedical Channel of LAMPF. The accelerator provides a variable low intensity pulse once every ten high intensity macropulses. The voltage on the detector is pulsed in coincidence with the low intensity pulse so that we were able to operate the detector under optimum data-taking conditions. A low noise two-stage preamplifier was built in connection with the pulsed mode operation. A comparison is made between data obtained in pulsed (high intensity beam) and unpulsed (low intensity beam) modes. The spectra obtained by the two methods agree within the experimental uncertainties.
Research Organization:
Los Alamos Scientific Lab., NM (USA)
DOE Contract Number:
W-7405-ENG-36
OSTI ID:
5247638
Report Number(s):
LA-UR-77-2400; CONF-771023-18
Country of Publication:
United States
Language:
English

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Related Subjects

440102 -- Radiation Instrumentation-- Radiation Dosemeters
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
560151* -- Radiation Effects on Animals-- Man
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACCELERATORS
BEAMS
DOSE RATES
DOSIMETRY
ENERGY LEVELS
ENERGY TRANSFER
IRRADIATION
LET
MEDICINE
MESON BEAMS
MICRODOSIMETRY
NUCLEAR MEDICINE
NUCLEON BEAMS
PARTICLE BEAMS
PATIENTS
PERFORMANCE TESTING
PION BEAMS
PROTON BEAMS
PULSED IRRADIATION
RADIATION DOSE DISTRIBUTIONS
RADIOLOGY
RADIOTHERAPY
SPATIAL DOSE DISTRIBUTIONS
TESTING
THERAPY
VARIATIONS