Alfred M. Strash

Gamma camera detection of oleic acid alveolar-capillary albumin leak

Abstract The computerized gamma camera was able to record and quantitate the alveolar-capillary membrane leak of radioactive technetium-99m-tagged human serum albumin in two dogs following intravenous oleic acid. In dog 1, given 0.1 ml/kg oleic acid, the increase in lung: heart radioactivity ratio, following oleic acid, became statistically significant within 12 (P

Body computed tomography in the evaluation of pediatric malignancy

Fifty-eight body CT scans were obtained in 33 children with malignant disease over a 2-year period at the Medical College of Virginia Hospitals. When compared with conventional radiography, excretory urography, nuclear medicine, and ultrasound, CT provided additional information in 26 patients (78%). In 17 patients CT was useful for monitoring response to surgery, radiation therapy, and/or chemotherapy.

Environmental Radiation at the EBR-II Site

The present environmental radiation state of the EBR-II site has been explored through application of new and highly sensitive methods which have resolved the environmental gamma and meson components at this highly relevant LMFBR site. The external gamma-ray radiation dose rate in the immediate vicinity of EBR-II (for gamma rays of energy in excess of 220 keV) was observed to be about 6 ?rad/hr. The cosmic-ray meson component contributes an additional dose rate of about 4.5 ?rad/hr. These two components result in an annual external dose to man of approximately 92 mrads. Although analysis of the gamma-ray spectra and soil samples reveals that the gamma-ray component is overwhelmingly derived from naturally occurring isotopes, statistically significant amounts of 137Cs and 125Sb (fission products). were observed in soil samples collected during this site survey. In addition, sizeable variations in the observed concentrations of 125Sb, 137Cs, 238Pu, and 239Pu of these EBR-II soil samples would appear to imply a non-uniform deposition pattern. However, the observed non-uniformity could be due to either local releases of fission products or drifting of surface soil containing fallout products. While fallout is certainly a significant contribution to the measured deposition, observed patterns and correlations qualitatively suggest that very low level releases could possibly have occurred at the EBR-II site some time in the past. Quantitative conclusions cannot possibly be based upon the very limited data available from the present site survey.