Results of three-year systematic measurement of nuclear fall-out

Journal Article · Mon Aug 01 04:00:00 EDT 1960 · Czechoslovak Journal of Physics

DOI:https://doi.org/10.1007/BF01557287· OSTI ID:4129167

Santholzer, V.

A survey is given of the results of measuring the radioactivity of rain- out from Nov. 1, 1955, to Feb. 1, 1960, and of fall-out from Nov. 1, 1958, to Feb. 1, 1960. The temporary cessation of nuclear weapon tests from Nov. 1, 1958, became apparent in the second half-year after the cessation by a decrease in the cumulative activity to 45% of the value for the first half-year. At the end of 1959 another decrease was apparent. It was shown on the basis of long- term investigation into the activity that the samples of fall-out with greater activity contain relatively very little admixture from earlier nuclear tests so that in the period of a few weeks to months the sets of fission products may be regarded as practically isolated. The exponent n in the relation A = at/sup -n/ is most frequently 1.2 for ths period of the first four months and for older samples is most often n = 1.5. The energy of the beta and gamma rays from fall-out was estimated on the basis of absorption measurements. It was shown that the quality of the beta radiation varies with the age of the samples. A brief survey is given of the results of determining the Sr/sup 90/ content in fall-out and milk, and of the methods of physical evidence of Sr/sup 90/ used.

• Research Organization: Charles Univ., Prague
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-002936
• OSTI ID: 4129167
• Journal Information: Czechoslovak Journal of Physics, Journal Name: Czechoslovak Journal of Physics Journal Issue: 8 Vol. 10; ISSN 0011-4626
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMIC EXPLOSIONS
BETA PARTICLES
ENERGY
FALLOUT
FISSION PRODUCTS
GAMMA RADIATION
HEALTH AND SAFETY
MEASURED VALUES
MILK
NUCLEAR EXPLOSIONS
RAIN
STRONTIUM 90