RADIOACTIVE SPECIES PRODUCED BY COSMIC RAYS IN THE AROOS IRON METEORITE

Journal Article · Mon May 01 04:00:00 EDT 1961 · Geochim. et Cosmochim. Acta

DOI:https://doi.org/10.1016/0016-7037(61)90046-1· OSTI ID:4013857

Honda, M; Arnold, J R

The iron meteorite Aroos fell on 24 November 1959. Usinng a sample received in February 1960, the content of eighteen cosmic-ray produced radioactive nuclides in this meteorite is measured. All were separated by wet chemical methods. A low-lcvel x-ray proportional counter was used for a group of electron-capture species; BETA - and gamma counting were used for the others. The activities of the long-lived species Be/sup 1//sup 0/ , A1/sup 2//sup 6/ and Mn/sup 5//sup 3/ were close to th ose found previously in the meteorites Williamstown and Grant. The value for C1/sup 3//sup 6/ was also consistent with earlier work. Much less K/sup 4//sup 0/ was found, indicating a shorter cosmic- ray age for Aroos. Comparison of the activities of the groups Mn/sup 2//sup 3/- Mn/sup 5//sup 4/ Ti/sup 4//sup 4/-Sc/sup 4//sup 6/-Ca/sup 4//sup 5/ Na/sup 2//sup 2/-A1 /sup 2//sup 6/ and C1/sup 3//sup 6/-Ar/sup 3//sup 7/-Ar/sup 3//sup /9 (data of Fireman and de Felice, 1960) indicates constancy of the cosmic-ray flux over millions of years within a factor of 2 or 3. Comparison of the groups Mn/sup 5// sup 4/-V/sup 4//sup 9/-Na/sup 2//sup 2/, and Ti/sup 4//sup 4/-Si/sup 3//sup 2/, among others shows the great importance of low-energy particles in synthesizing products close to the target mass. Quantitative discussions will be given in a later paper. (auth)

• Research Organization: Univ. of California, La Jolla
• NSA Number: NSA-15-018627
• OSTI ID: 4013857
• Journal Information: Geochim. et Cosmochim. Acta, Journal Name: Geochim. et Cosmochim. Acta Vol. Vol: 23
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AGE ESTIMATION
ALUMINUM 26
ARGON 37
ARGON 39
ASTROPHYSICS
BACKGROUND
BERYLLIUM 10
CALCIUM 45
CAPTURE
CHLORINE 36
COSMIC RADIATION
COUNTERS
ELECTRONS
ENERGY RANGE
HALF-LIFE
INSTRUMENTS
INTERACTIONS
IRON
LOW LEVEL COUNTERS
MANGANESE 53
MANGANESE 54
MASS
MEASURED VALUES
METEORITES
PHYSICS
POTASSIUM 40
PRODUCTION
PROPORTIONAL COUNTERS
QUALITATIVE ANALYSIS
RADIOACTIVITY
RADIOISOTOPES
SCANDIUM 46
SEPARATION PROCESSES
SILICON 32
SODIUM 22
TITANIUM 44
VANADIUM 49
X RADIATION