Dosimetry of iridium-192 and cesium-137 seed sources

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6330988

Thomason, C

The use of {sup 192}Ir in brachytherapy implants both alone and in conjuction with other modalities for the treatment of various types of cancer has greatly increased in recent years. This increased usage has led to a greater need for detailed information concerning the dose distribution surrounding commerically available {sup 192}Ir seed sources. The radiation does distribution in water was measured using LiF thermoluminescent dosimeters for an {sup 192}Ir seed source with platinum encapsulation, for an {sup 192}Ir seed source with stainless steel encapsulation and for a {sup 137}Cs seed source intended as a substitute for {sup 192}Ir. The Electron-Gamma-Shower (EGS) computer code, which is a package for doing Monte Carlo simulation of the transport of photons and electrons in any medium or geometry specified by the user, also was used to study the dose distribution around these seed sources. In addition, the exposure rate constant, exposure rate at 1 meter, transmission through the source capsule, f-factor, and energy distribution exiting the source capsule were evaluated by Monte Carlo simulation of these three sources. Good agreement was seen between the measured data and the Monte Carlo generated data. In addition to producing valuable dosimetric data, this study has demonstrated that Monte Carlo modeling of {sup 192}Ir and {sup 137}Cs seed sources using the EGS Monte Carlo code can provide an accurate means of evaluating these data.

• Research Organization: Wisconsin Univ., Madison, WI (USA)
• OSTI ID: 6330988
• Country of Publication: United States
• Language: English

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
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COMPUTER CODES
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DOSEMETERS
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E CODES
ELECTRON CAPTURE RADIOISOTOPES
HEAVY NUCLEI
HYDROGEN COMPOUNDS
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IRIDIUM 192
IRIDIUM ISOTOPES
ISOMERIC TRANSITION
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LUMINESCENT DOSEMETERS
MEASURING INSTRUMENTS
MEDICINE
MONTE CARLO METHOD
NUCLEAR MEDICINE
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
RADIATION DOSE DISTRIBUTIONS
RADIATION SOURCE IMPLANTS
RADIATION SOURCES
RADIOISOTOPES
RADIOLOGY
RADIOTHERAPY
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THERMOLUMINESCENT DOSEMETERS
THERMOLUMINESCENT DOSIMETRY
WATER
YEARS LIVING RADIOISOTOPES