Considerations on the disturbing effect of phosphorescence and that of after-pulsing in measuring the absolute activity of low energy beta isotopes

1968 ◽  
Vol 19 (9) ◽  
pp. 712-713 ◽  
Author(s):  
P. Fodor-Csányi ◽  
E. Szilágyi-Györi
Keyword(s):  
Low Energy ◽  
Absolute Activity ◽  
The Absolute

X-ray flux from discrete sources

1970 ◽  
Vol 37 ◽  
pp. 88-93
Author(s):  
U. R. Rao ◽  
E. V. Chitnis ◽  
A. S. Prakasarao ◽  
U. B. Jayanthi
Keyword(s):  
Energy Spectrum ◽  
Energy Range ◽  
Low Energy ◽  
X Rays ◽  
X Ray ◽  
Preliminary Results ◽  
Absolute Flux ◽  
The Absolute

Preliminary results of two rocket flights carrying X-ray payloads conducted from Thumba Equatorial Rocket Launching Station (TERLS), Trivandrum, India, on November 3, 1968, and November 7, 1968, respectively, are presented. The results indicate the first evidence for the existence of low energy X-ray flux in the energy range 2–20 keV from Cen-X2 source since the reported extinction in May, 1967. The energy spectrum and the absolute flux of X-rays from Cen-X2, Sco-X1 and Tau-X1 are presented and compared with other observations.

Atomic disintegration by particles of low energy

1936 ◽  
Vol 32 (4) ◽  
pp. 643-647 ◽  
Author(s):  
E. H. S. Burhop
Keyword(s):  
Low Voltage ◽  
Ion Beam ◽  
Low Energy ◽  
Ion Currents ◽  
Absolute Yield ◽  
The Absolute ◽  
Α Particles

A source of ions consisting of a low voltage arc, yielding homogeneous ion currents of the order of ½ milliampere at low potentials is described. With such a source, atomic disintegrations have been observed with ion beam energies of less than 8kV. Approximate values of the absolute yield for protons from the deuteron on deuterium disintegration, and α-particles from the protons on lithium disintegration are obtained.

scholarly journals Reporting 14C Activities and Concentrations

Radiocarbon ◽  
1999 ◽  
Vol 41 (3) ◽  
pp. 227-239 ◽  
Author(s):  
Willem G Mook ◽  
Johannes van der Plicht
Keyword(s):  
Stable Isotopes ◽  
Activity Ratio ◽  
Specific Activity ◽  
Relative Activity ◽  
Standard Material ◽  
Absolute Activity ◽  
Measuring Techniques ◽  
The Absolute ◽  
The Difference

Three modes of reporting 14C activities are in use, in part analogous to the internationally accepted (IAEA) conventions for stable isotopes: (1) absolute activity, the specific activity of 14C or the activity per gram of carbon; (2) activity ratio, the ratio between the absolute activities of a sample and the standard; and (3) relative activity, the difference between the absolute activities of a sample and standard material, relative to the absolute standard activity. The basic definitions originate from decisions made by the radiocarbon community at its past conferences. Stuiver and Polach (1977) reviewed and sought to specify the definitions and conventions. Several colleagues, however, have experienced inadequacies and pitfalls in the definitions and use of symbols. Furthermore, the latter have to be slightly amended because of the use of modern measuring techniques.This paper is intended to provide a consistent set of reporting symbols and definitions, illustrated by some practical examples.

SIZE DISTRIBUTION OF COSMIC RAY STARS IN PHOTOGRAPHIC EMULSIONS

1952 ◽  
Vol 30 (5) ◽  
pp. 453-458 ◽  
Author(s):  
J. Y. Mei
Keyword(s):  
Size Distribution ◽  
Distribution Curve ◽  
Cosmic Ray ◽  
Low Energy ◽  
Absolute Frequency ◽  
Primary Particles ◽  
Star Production ◽  
Nonionizing Radiation ◽  
The Absolute ◽  
Photographic Emulsions

In an analysis of cosmic ray stars found in Ilford G5 emulsions exposed at about 85,000 ft. the star-size distribution curve shows a change in slope at a prong number of about 8.5. A similar effect is shown for emulsions exposed at airplane altitudes, and it is assumed that the effect is mainly due to the composition of the emulsions. While the primary particles producing the stars at about 85,000 ft. are mostly protons, about 50% of the low energy stars are produced by nonionizing radiation, presumably neutrons. a-Particles and heavier nuclei produce about 30% of the larger energetic stars. The absolute frequency of star production is given.

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