Dosimetric calculations and measurements of gold plaque ophthalmic irradiators using iridium-192 and iodine-125 seeds
The dosimetry of ophthalmic plaques designed to hold iridium-192 or iodine-125 seeds is investigated experimentally and by means of a computer model. A phantom for thermoluminescent dosimetry (TLD) which permits measurements to within 2 mm of the plaque surface is described. TLD data are compared with model calculations that take into account the active length of the seeds, anisotropy of dose distribution from single seeds, and scatter within the phantom. An isotropic point source calculational model is accurate for clinical calculations, particularly at depths greater than 5 mm. Relative central axis dose measurements for /sup 125/I in a gold plaque are also in agreement with the model. Comparisons of /sup 192/Ir, /sup 125/I and /sup 60/Co plaques are presented. The relative advantages of using these isotopes in eye plaques are discussed.
- Research Organization:
- Univ. of Southern California School of Medicine, Los Angeles (USA)
- OSTI ID:
- 6820392
- Journal Information:
- Int. J. Radiat. Oncol., Biol. Phys.; (United States), Journal Name: Int. J. Radiat. Oncol., Biol. Phys.; (United States) Vol. 15:1; ISSN IOBPD
- Country of Publication:
- United States
- Language:
- English
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655003* -- Medical Physics-- Dosimetry
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BODY
BODY AREAS
CALCULATION METHODS
COBALT 60
COBALT ISOTOPES
COMPUTERIZED SIMULATION
DAYS LIVING RADIOISOTOPES
DOSES
DOSIMETRY
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EYES
FACE
GOLD
HEAD
HEAVY NUCLEI
IMPLANTS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE 125
IODINE ISOTOPES
IRIDIUM 192
IRIDIUM ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEDICINE
METALS
MINUTES LIVING RADIOISOTOPES
MOCKUP
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
OPHTHALMOLOGY
ORGANS
PHANTOMS
RADIATION DOSE DISTRIBUTIONS
RADIATION DOSES
RADIATION SOURCE IMPLANTS
RADIATION SOURCES
RADIOISOTOPES
SCATTERING
SENSE ORGANS
SIMULATION
STRUCTURAL MODELS
THERMOLUMINESCENT DOSIMETRY
TRANSITION ELEMENTS
YEARS LIVING RADIOISOTOPES