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- ANNUAL REPORT, JULY 1, 1962
- The research and development work is reported in sections on physical sciences and engineering, life sciences, and supporting activities. Separate abstracts were prepared for each of these sections. (J.R.D.)
- UPTAKE AND TRANSFER OF FALLOUT I$sup 131$ IN PREGNANT WOMEN
- Levels of I/sup 131/ in pregnant women and controls were determined by whole-body counting with a scintillation crystal placed over the thyroid. No detectable levels of I/sup 131/ were found. Ten fetal thyroids and milk samples were also negative for I/sup 131/. In a second series counted during Oct. through Dec. 1962, levels of I/sup 131/ in pregnant women ranged from 0 to 160 pC. In 5 of the offspring of these women measured from 18 to 34 days after birth, no significant levels of I/sup 131/ were detected. Levels of I/sup 131/ in milk samples collected during this period ranged from 25 to 180 pC/qt. Apparently no more I/sup 131/ was taken up by pregnant than by nonpregnant women. The data suggest a correlation between milk consumption and thyroid I/sup 131/ content. (C.H.)
- Distribution of Transfused Tritiated Cytidine Labeled Leukocytes and Red Cells in the Bone Marrow of Normal and Irradiated Rats
- In normal rats and after whole-body irradiation with 550-r x-rays, the fate in the bone marrow of labeled nucleated and red cells of transfused peripheral blood was observed autoradiographically. Labeled nucleated cells, most of which were lymphocyte-like cells, readily migrated into the marrow parenchyma in normal animals (2 cells/1000 parenchymal cells/hr). Following irradiation to at least 27 to 51 hr, this migration appeared to be relatively increased. Beyond this time, parenchymal areas were more difficult to be defined as such. Labeled red cells were rarely observed to enter parenchyma despite the presence of nonlabeled erythrocytes within the parenchymal structure after irradiation. The vascular bed following irradiation increased greatly as the parenchyma diminished to a minimum of less than 10% of control at 75 hr. Despite these changes in the architecture of the marrow, the average density of labeled cells per area of marrow corresponded to values expected on the assumption of a free-flowing circulation. The presently-used technique did not allow distinguishirg at all times between a free-flowing circulation through intact sinusoids or through areas in which the sinusoidal wall as such was destroyed. (auth)
- Electrostatic Classification of Submicron Airborne Particles : Final Report, August 16, 1961 to January 31, 1963
- From abstract: "This project was a study of electrostatic classification of submicron aerosols. Classification of particles as small as 0.006-[mu]-diameter was shown to be feasible, and good classification of atmospheric dust was achieved. However, a practical solution to the problem of overlapping between particles larger and smaller than 0.1 [mu], the point of minimum electric mobility, was not found."
- Applied Mathematics Division Summary Report, July 1, 1961-June 30, 1962
- A summary of each computer program initiated during the report period is given. Over 130 programs are described briefly. Work is also being carried out on the completion of the GEORGE-FLIP Computer system and the development of retrieval and pattern recognltion systems. (M.C.G.)
- PAPERS PRESENTED AT THE EIGHTH ANNUAL MEETING ON BIO-ASSAY AND ANALYTICAL CHEMISTRY, AUGUSTA, GEORGIA, OCTOBER 18-19, 1962
- Nine papers are included which treat the determination of cesium, tritium, americium-241, plutonium, thoron, and other radionuclides under a variety of conditions. One treats the preparation of standard alpha sources. Separate abstracts were prepared for six of the papers; the reraaining three papers were previously abstracted in NSA. (D.L.C.)