Some Remarks Concerning the Absolute Measurement of $beta$ Emitters by the 4 $pi$ Counter; QUELQUES REMARQUES SUR LA MESURE ABSOLUE DES EMETTEURS $beta$ AU COMPTEUR 4 $pi$

Technical Report · Sat Oct 31 04:00:00 EST 1959

OSTI ID:4267464

Grinberg, B; Le Gallic, Y

The precision obtainable with a proportional or Geiger-Mueller 4 pi counter in the determination of radioactivities depends on the precision with which the various corrections are evaluated. One of the most important corrections is the correction for absorption in the film serving as support for the source. To determine conditions in which the absorption could be maintained at a negligible level, a study was made with a 4 pi Geiger-Mueller tube. The performance of the tube using very thin films was determined. Film thicknesses of 5 mu g/cm/sup 2/ were obtained, and such films made it possible to eliminate completely the absorption correction for energies higher than 0.3 Mev. For energies lower than 0.3 Mev, the addition of a coincidence amplifier with resolution time slightly higher than the average transport'' time of the particles eliminates the need for absorption corrections. (J.S.R.)

• Research Organization: Commissariat a l'Energie Atomique, Paris
• NSA Number: NSA-13-006725
• OSTI ID: 4267464
• Report Number(s): A/CONF.15/P/1208
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
AMPLIFIERS
BETA DETECTION
BETA PARTICLES
COINCIDENCE METHODS
CONFIGURATION
COUNTERS
EFFICIENCY
ENERGY RANGE
ERRORS
FILMS
FOUR- PI COUNTERS
GEIGER-MUELLER COUNTERS
INSTRUMENTS
MEV RANGE
OPERATION
PARTICLE SOURCES
PERFORMANCE
PROPORTIONAL COUNTERS
QUANTITATIVE ANALYSIS
RADIOACTIVITY
RESOLUTION
THICKNESS
TRANSPORT