Studies of fresh and fossil tracks in meteoritic hypersthene
Description
From measurements of the total recordable lengths of fossil tracks and Fe ion tracks in meteoritic hypersthene, the abundance of Fe relative to all VH ions (20 <= Z <= 28) in the time-averaged cosmic ray flux is found to be approximately 0.35. After allowance is made for the effects of fragmentation of nuclei at a depth of approximately 11 cm within the meteorite, this value is found to be in broad agreement with present day measurements. These crystals have been irradiated with a number of heavy ions with a view to calibrating them for the identification of VVH cosmic rays by measurement of track etch velocity, Vsub(T), as a function of residual range. A good fit to the calibration data is obtained by using a value for the constant K in the primary ionisation equation of 10.5 (+- 0.5). The relationship between Vsub(T) and primary ionisation J, appears to be approximately linear. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Aus Messungen der gesamten registrierbaren Laengen fossiler Spuren und Eisenionspuren in meteoritischem Hypersthen ergab sich die Haeufigkeit von Eisen gegenueber allen VH Ionen (20<=Z<=28) in dem zeitlich gemittelten kosmischen Strahlenfluss als ungefaehr 0,35. Nach Zugabe eines Spielraums fuer die Auswirkungen der Spaltung der Kerne bei einer Tiefe von ungefaehr 11 cm in dem Meteoriten, stimmt der gefundene Wert weitgehend mit den gegenwaertigen Messungen ueberein. Dieselben Kristalle wurden mit einer Anzahl Schwerionen bestrahlt, zwecks Eichung fuer eine Identifizierung von VVH-kosmischen Strahlen durch Messung der Aetzgeschwindigkeit in der Kernspur, Vsub(T), als Funktion des Restbereichs. Eine gute Anpassung an die Eichdaten wird durch die Verwendung eines Wertes von 10,5 (-+ 0,5) fuer die Konstante K in der Gleichung fuer primaere Ionisation erreicht. Die Beziehung zwischen Vsub(T) und primaerer Ionisation J scheint annaehernd linear zu sein. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 8 p.
- Report number
- AED-Conf--76-421-008
Conference
- Title
- 9. international conference on solid state nuclear track detectors and meeting of the Working Group on Space Biophysics of the Council of Europe.
- Dates
- 30 Sep 1976.
- Place
- Neuherberg/Muenchen, Germany, F.R.
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 8291560
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- CALIBRATION; COSMIC RADIATION; ETCHING; HEAVY IONS; IRRADIATION; PARTICLE TRACKS; RANGE; STONE METEORITES; TRAJECTORIES
- Descriptors DEC
- CHARGED PARTICLES; IONIZING RADIATIONS; IONS; METEORITES; RADIATIONS; SURFACE FINISHING
Optional Information
- Notes
- 4 figs.; 8 refs.