Comparison of solid phantoms with water for dosimetry of /sup 125/I brachytherapy sources

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Med. Phys.; (United States)

OSTI ID:7063842

Meigooni, A S; Meli, J A; Nath, R

Dosimetry of brachytherapy sources is critically dependent on precise measurement of the source--detector distance. A solid phantom can be precisely machined and hence distances can be accurately determined. In this work LiF thermoluminescent chips are used for absolute dose rate measurements in solid water, polymethylmethacrylate (PMMA), and polystyrene. These media are examined for their suitability in the dosimetry of /sup 125/I by comparing depth doses in each phantom. Measurements and Monte Carlo calculations show that solid water is equivalent to water for the dosimetry of /sup 125/I seeds, however, polystyrene and PMMA are not equivalent to water. Also, photon energy spectra for several depths in each phantom material have been calculated and are used to determine average photon energy and mass energy absorption coefficients as a function of depth.

• Research Organization: Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut 06510
• OSTI ID: 7063842
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 15:5; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
BETA DECAY RADIOISOTOPES
COMPARATIVE EVALUATIONS
DAYS LIVING RADIOISOTOPES
DEPTH DOSE DISTRIBUTIONS
DOSE RATES
DOSIMETRY
ELECTRON CAPTURE RADIOISOTOPES
ESTERS
GAMMA DOSIMETRY
HYDROGEN COMPOUNDS
ICE
IMPLANTS
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPES
MATERIALS
MOCKUP
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHANTOMS
PLASTICS
PMMA
POLYACRYLATES
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
RADIATION DOSE DISTRIBUTIONS
RADIATION SOURCE IMPLANTS
RADIATION SOURCES
RADIOISOTOPES
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
SYNTHETIC MATERIALS
THERMOLUMINESCENT DOSIMETRY
WATER