THREE YEARS OF SYSTEMATIC MEASUREMENTS OF FALLOUT AT JASSY

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Acad. Rep. Populare Romine, Filiala Iasi, Studii Cercetari Stiint., Fiz. Stiinte Tehn.

OSTI ID:4728130

Mageru, V; Blanariu, D

The results of daily measurements on the fallout at Jassy between September 1, 1958, and September 1, 1961, are reported. After a description of the methods used (collecting, preparation, and measurement of the samples), the results are given in the form of histograms and explained. Three or four French nuclear experiments in 1960 caused sharp activity maxima at Jassy. The mean and monthly specific activity of rain water reflected the variation of the contamination of the lower troposphere. After each new injection of radioactive materials, the concentration decreased with an effective decay period of 45 days. For the determination of the isotopic composition of fallout samples, radiochemical analysis and radiation absorption of aluminum were used. In all the absorption curves, three distinct components could be distinguished: a hard component (2.5 Mev), a mean component (1.16 Mev), and a soft component (0.39 Mev). A comparison was made between experimental and theoretical data, and an attempt was made to explain the surplus of soft radiations found in the winter samples of 1958-59. It was found that in the old fallout samples, particles with very small diameter predominate, whereas in recent depositions large particles 5 to 8 mm appear. After three years of measuring the fallout accumulations at Jassy, a value of 42.5 mC/km/sup 2/ was attained. The Sr/sup 90/ concentration in rain water shows a sharp seasonal variation each year because of the exchange of air masses between the stratosphere and the troposphere. The soil deposition of Sr/ sup 90/ occurred at a rate between 0.03 and 0.69 mC/km/sup 2/ per month, and its value has reached 6.7 mC/km/sup 2/. The external irradiation dose given by the fallout was evaluated as 20.2 mr/generation. (trauth)

• Research Organization: Inst. of Chemistry and Physics, Jassy
• NSA Number: NSA-17-021459
• OSTI ID: 4728130
• Journal Information: Acad. Rep. Populare Romine, Filiala Iasi, Studii Cercetari Stiint., Fiz. Stiinte Tehn., Journal Name: Acad. Rep. Populare Romine, Filiala Iasi, Studii Cercetari Stiint., Fiz. Stiinte Tehn. Vol. Vol: 13
• Country of Publication: Country unknown/Code not available
• Language: Rumanian

Related Subjects

ATMOSPHERE
BIOLOGY AND MEDICINE
ENVIRONMENT
FALLOUT
MAN
MEASURED VALUES
NUCLEAR EXPLOSIONS
RADIATION DOSES
RADIOCHEMISTRY
RAIN
SAMPLING
SOILS
STRONTIUM 90
VARIATIONS