Variation in thyroid calibration efficiencies as a function of phantom design for I-125
Four commercially available thyroid phantoms were evaluated to determine the effect that choice of phantom would have on the determination of I-125 activity in the thyroid. Efficiency calibration values for a 5.0-cm diameter 1-mm thick NaI (Tl) detector were determined as a function of distance from the phantom along the central axis and at angles up to 45 off axis using I-125 as the radionuclide of interest. Results indicate that substantial variations in the estimate of radioactivity in the thyroid will occur based on choice of calibration phantom. Using the Humanoid System, Inc. Realistic Phantom as the reference phantom, one could experience differences in estimated activity in the human thyroid that range from 0.86 to 2.94. 6 refs., 6 figs., 3 tabs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA); Niagara Mohawk Power Corp., Scriba, NY (USA); Pittsburgh Univ., PA (USA); Saint Paul Medical Center, Dallas, TX (USA). Dept. of Radiation Oncology
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6233739
- Report Number(s):
- BNL-39931; CONF-870705-3; ON: DE87014294
- Resource Relation:
- Conference: Annual meeting of the Health Physics Society, Salt Lake City, UT, USA, 5 Jul 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
62 RADIOLOGY AND NUCLEAR MEDICINE
IODINE 125
RADIONUCLIDE KINETICS
PHANTOMS
COMPARATIVE EVALUATIONS
RADIATION DOSE UNITS
CALIBRATION
THYROID
NAI DETECTORS
BETA DECAY RADIOISOTOPES
BODY
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ENDOCRINE GLANDS
GLANDS
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
MOCKUP
NUCLEI
ODD-EVEN NUCLEI
ORGANS
RADIATION DETECTORS
RADIOISOTOPES
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
STRUCTURAL MODELS
UNITS
655003* - Medical Physics- Dosimetry
560161 - Radionuclide Effects
Kinetics
& Toxicology- Man
550603 - Medicine- External Radiation in Therapy- (1980-)