Radial dose distribution of /sup 192/Ir and /sup 137/Cs seed sources
Journal Article
·
· Med. Phys.; (United States)
OSTI ID:6443982
The radial dose distributions in water around /sup 192/ Ir seed sources with both platinum and stainless steel encapsulation have been measured using LiF thermoluminescent dosimeters (TLD) for distances of 1 to 12 cm along the perpendicular bisector of the source to determine the effect of source encapsulation. Similar measurements also have been made around a /sup 137/ Cs seed source of comparable dimensions. The data were fit to a third order polynomial to obtain an empirical equation for the radial dose factor which then can be used in dosimetry. The coefficients of this equation for each of the three sources are given. The radial dose factor of the stainless steel encapsulated /sup 192/ Ir and that of the platinum encapsulated /sup 192/ Ir agree to within 2%. The radial dose distributions measured here for /sup 192/ Ir with either type of encapsulation and for /sup 137/ Cs are indistinguishable from those of other authors when considering uncertainties involved. For clinical dosimetry based on isotropic point or line source models, any of these equations may be used without significantly affecting accuracy.
- Research Organization:
- Department of Medical Physics, University of Wisconsin, Madison, Wisconsin 53706
- OSTI ID:
- 6443982
- Journal Information:
- Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 16:2; ISSN MPHYA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CESIUM 137
CESIUM ISOTOPES
DAYS LIVING RADIOISOTOPES
DOSEMETERS
DOSIMETRY
ELECTRON CAPTURE RADIOISOTOPES
GAMMA DOSIMETRY
HEAVY NUCLEI
HYDROGEN COMPOUNDS
IMPLANTS
INTERNAL CONVERSION RADIOISOTOPES
IRIDIUM 192
IRIDIUM ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
MOCKUP
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION SOURCE IMPLANTS
RADIATION SOURCES
RADIOISOTOPES
STRUCTURAL MODELS
THERMOLUMINESCENT DOSEMETERS
WATER
YEARS LIVING RADIOISOTOPES
655003* -- Medical Physics-- Dosimetry
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CESIUM 137
CESIUM ISOTOPES
DAYS LIVING RADIOISOTOPES
DOSEMETERS
DOSIMETRY
ELECTRON CAPTURE RADIOISOTOPES
GAMMA DOSIMETRY
HEAVY NUCLEI
HYDROGEN COMPOUNDS
IMPLANTS
INTERNAL CONVERSION RADIOISOTOPES
IRIDIUM 192
IRIDIUM ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
MOCKUP
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION SOURCE IMPLANTS
RADIATION SOURCES
RADIOISOTOPES
STRUCTURAL MODELS
THERMOLUMINESCENT DOSEMETERS
WATER
YEARS LIVING RADIOISOTOPES