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PubMed1961

Distribution of strontium-90 in a 1959 wheat sample.

At least 22 percent of the strontium-90 found in a sample of wheat harvested in 1959 was due to direct deposition. Twenty-seven percent of the total strontium-90 content of this wheat sample was contained in the outermost bran layer.

Food↗
PubMed1966

Stontium-90 fallout from surface and underground nuclear tests.

Deposition of strontium-90 per unit area per unit fission energy from surface blast of the first Chinese atomic bomb was several times heavier than that from an earlier atmospheric test series. The venting of a Russian large-scale underground test also significantly increased deposition of strontium-90 at Niigata, Japan.

China↗
PubMed1967

Strontium-90 deposition in New York City.

Measurements of strontium-90 deposited in New York City over the past 12 years make for broader understanding of the fallout phenomenon. The data indicate a stratospheric half-residence time of 8 to 10 months. The seasonal oscillation of strontium-90 fallout is very symmetrical and consistent from year to year and completely independent of the timing and magnitude of nuclear tests. The predicted fallout of strontium-90 in 1970 is less than 1 percent of that during the peak year 1963.

History, 20th Century↗
PubMed1969

Strontium-90: concentrations in surface waters of the Atlantic Ocean.

From the large body of analyses of strontium-90 in surface waters of the Atlantic Ocean, annual average concentrations (from 10 degrees N to 70 degrees N) have been compared to those predicted. The data indicate higher fall-out over ocean than over land and confirm the rapid rates of down-mixing shown by most studies of subsurface strontium-90.

Oceanography↗
PubMed1969

Strontium-90 concentration factors of lake plankton, macrophytes, and substrates.

The ratio of concentration of strontium-90 in living and inert lake components to that in lake water (concentration factors) was determined for plankton, macrophytes, and substrates in eutrophic, mesotropric-eutrophic, and dystrophic Latgalian lakes. Concentration factors of strontium-90 in aquatic organisms and substrates are higher in a dystrophic lake than in the other types.

Geological Phenomena↗
PubMed1969

Radionuclide concentrations in surface air: direct relationship to global fallout.

By relating the average monthly hemispheric concentrations of radionuclides in the suirface air to the monthly hemispheric fallout of these nuclides, we have derived proportionility constants. For every disintegration per minutte of a radioactive nutclide per 1000 cubic meters of the suirface air in the Northern Hemisphere, 3.3 kilocuirics of that nutclide will be deposited on the surface; in the Soluthern Hemisphere, 5.0 kilocutries will deposit for every disintegration per minutte per 1000 cuibic meters. Oni the basis of thlese factors, the global deposition of radionuclides can be estimated from a relatively small numbnber of measurements of the radioactivity in the surface air.

Air Pollution, Radioactive↗
PubMed1970

Strontium-90: effects of chronic ingestion on farrowing performance of miniature swine.

In experiments involving the ingestion of strontium-90 by nearly 800 female miniature swine and extending over three generations, no significant differences in litter size, percentage of stillborn, or birth weight were observed between controls and animals ingesting up to 625 microcuries of strontium-90 per day. At 625 microcuries per day, these animals were ingesting more than a million times the peak value of strontium-90 ever reported in the American diet. Animals on 3100 microcuries per day did not survive the gestation period. From these studies, it is evident that feeding levels of strontium-90 high enough to affect fetal or neonatal mortality in this species will not permit maternal survival long enough for the bearing of young.

Animals↗
PubMed1969

Strontium-85 scanning of suspected bone disease.

Strontium-85 scanning of suspected bone lesions in 81 patients has added to the criteria for the diagnosis of malignant and other lesions of bone. Of 46 patients with a previous history of malignant disease and skeletal symptoms negative radiological findings were recorded in 19, but nine of these had positive scans, eight of which when followed up over periods of up to four years proved to be metastatic. A similar prevalence of positive scans occurred in patients without a previous history of malignancy. Because of the anatomical localization of lesions made possible by this technique a tissue diagnosis was made in six patients, while fields of radiotherapy were altered in another seven. This technique can improve the management of patients with suspected bone disease.

Aged↗