Activity distribution of a cobalt-60 teletherapy source
- 1. Department of Medical Biophysics, University of Western Ontario, London (Canada)
Description
In the course of quantifying the effect of radiation source size on the spatial resolution of portal images, a concentric ring structure in the activity distribution of a Cobalt-60 teletherapy source has been observed. The activity distribution was measured using a strip integral technique and confirmed independently by a contact radiograph of an identical but inactive source replica. These two techniques suggested that this concentric ring structure is due to the packing configuration of the small 60Co pellets that constitute the source. The source modulation transfer function (MTF) showed that this ring structure has a negligible influence on the spatial resolution of therapy images when compared to the effect of the large size of the 60Co source
Additional details
Publishing Information
- Journal Title
- Medical Physics
- Journal Volume
- 18
- Journal Issue
- 2
- Series
- Med. Phys.
- Journal Page Range
- 288-291
- ISSN
- 0094-2405
- CODEN
- MPHYA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 22080905
- Subject category
- S62: RADIOLOGY AND NUCLEAR MEDICINE;
- Descriptors DEI
- COBALT 60; MAN; RADIATION DOSES; RADIATION SOURCES; RADIOTHERAPY; SPATIAL RESOLUTION
- Descriptors DEC
- ANIMALS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; COBALT ISOTOPES; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTO; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MAMMALS; MEDICINE; MINUTES LIVING RADIOISOTOPES; NUCLEI; ODD-ODD NUCLEI; PRIMATES; RADIOISOTOPES; RESOLUTION; THERAPY; VERTEBRATES; YEARS LIVING RADIOISOTOPES