In vivo measurements of bone-seeking radionuclides. Annual report, December 1, 1982-November 30, 1983
This report summarizes results obtained in seven areas. Five subjects with well defined Am-241 body burdens have been measured using NaI-CsI(T1) detectors surrounding the head or positioned over the anterior knee surfaces. The observed ratio of net count-rate at the skull to net count-rate at the anterior knee surfaces was found to vary with values ranging from 1.16 to 2.45. Previously developed calibration values for men have been determined to be inadequate for application to female workers due to the variability in chest wall thickness and different photon attenuation characteristics of breast tissue in women. The relative count-rates for each individual among the counting geometries reflected the attenuation of the Nb-92m x-rays in the overlying tissue. The measurement performed with a single phoswich detector positioned centrally over the sternum surprisingly gave the highest count-rate for two out of the four subjects. It is expected that the net counts/x-ray emitted for each individual, when plotted as a function of overlying absorber thickness, will produce a series of single exponential curves which can be used to predict the absolute calibration value for Nb-92m in the lungs. Additional studies describing the time-related fate and distribution in the body of radon and radon daughters present as a result of drinking this well water are currently in progress. There appears to be a possibility of obtaining a significantly increased and variable whole body count-rate as related to a function of the quantity of water consumed and the time of in vivo measurement. Subjects who were treated therapeutically with radon seeds 25 to 34 years ago were observed in our whole body counting facility using NaI-CsI(T1) detectors. The radiation dose due to the characteristic Pu x-ray, the bremsstrahlung continuum and any beta radiation penetrating the gold sheath, is being determined.
- Research Organization:
- New York Univ., NY (USA). Inst. of Environmental Medicine
- DOE Contract Number:
- AC02-77EV04326
- OSTI ID:
- 5664456
- Report Number(s):
- DOE/EV/04326-5; COO-4326-5; ON: DE84003034
- Country of Publication:
- United States
- Language:
- English
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62 RADIOLOGY AND NUCLEAR MEDICINE
AMERICIUM 241
TISSUE DISTRIBUTION
FEMALES
RADIOISOTOPE SCANNING
LUNGS
NIOBIUM 92
INHALATION
LEAD 210
RADIATION HAZARDS
RADIATION SOURCE IMPLANTS
RADON 222
DRINKING WATER
NATURAL RADIOACTIVITY
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALKALI METAL ISOTOPES
ALPHA DECAY RADIOISOTOPES
AMERICIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BODY
CESIUM ISOTOPES
COBALT ISOTOPES
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
HAZARDS
HEALTH HAZARDS
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
IMPLANTS
INTAKE
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD ISOTOPES
MINUTES LIVING RADIOISOTOPES
MOCKUP
NIOBIUM ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
ORGANS
OXYGEN COMPOUNDS
RADIATION DOSE DISTRIBUTIONS
RADIATION SOURCES
RADIOACTIVITY
RADIOISOTOPES
RADON ISOTOPES
RESPIRATORY SYSTEM
SKELETON
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
WATER
YEARS LIVING RADIOISOTOPES
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