Measurement of the restricted dose mean LET outside the primary beam of a /sup 60/Co radiotherapy unit
Journal Article
·
· Radiat. Res.; (United States)
A recently developed method for the direct measurement of the restricted dose mean LET (cutoff energy = 500 eV) of an unspecified photon or electron radiation field with the high-pressure ionization chamber has been utilized to investigate the variation of this radiobiologically important parameter outside the primary beam of a clinical /sup 60/Co unit. A small high-pressure tissue-equivalent ionization chamber was used, and its characteristics and experimental considerations for the present investigation are reported. Measurement of the restricted dose mean LET at the examined points outside the primary /sup 60/Co beam showed an increase of 50% with respect to the restricted dose mean LET of the uncollimated /sup 60/Co beam. No significant variation was noted with off-central axis distance, field size, wedge filter, or depth below Perspex slabs. Dose rates at the points of measurement outside the primary /sup 60/Co beam were 1-5% of the dose rate in the primary beam.
- Research Organization:
- Metaxa Memorial, Piraeus, Greece
- OSTI ID:
- 6788853
- Journal Information:
- Radiat. Res.; (United States), Journal Name: Radiat. Res.; (United States) Vol. 1; ISSN RAREA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
550603* -- Medicine-- External Radiation in Therapy-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COBALT 60
COBALT ISOTOPES
DOSIMETRY
ELECTRONS
ELEMENTARY PARTICLES
ENERGY TRANSFER
FERMIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZATION CHAMBERS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEPTONS
LET
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEDICINE
MINUTES LIVING RADIOISOTOPES
MONITORING
NUCLEAR MEDICINE
NUCLEI
ODD-ODD NUCLEI
PHOTONS
RADIATION DETECTORS
RADIATION MONITORING
RADIOISOTOPES
RADIOLOGY
RADIOTHERAPY
THERAPY
YEARS LIVING RADIOISOTOPES
62 RADIOLOGY AND NUCLEAR MEDICINE
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COBALT 60
COBALT ISOTOPES
DOSIMETRY
ELECTRONS
ELEMENTARY PARTICLES
ENERGY TRANSFER
FERMIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZATION CHAMBERS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEPTONS
LET
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEDICINE
MINUTES LIVING RADIOISOTOPES
MONITORING
NUCLEAR MEDICINE
NUCLEI
ODD-ODD NUCLEI
PHOTONS
RADIATION DETECTORS
RADIATION MONITORING
RADIOISOTOPES
RADIOLOGY
RADIOTHERAPY
THERAPY
YEARS LIVING RADIOISOTOPES