Electron-slowing-down spectrum in Cu beta rays from Cu⁶⁴

Thesis/Dissertation · Fri May 01 04:00:00 EDT 1964

DOI:https://doi.org/10.2172/4013288· OSTI ID:4013288

McConnell, W. J. ^[1]; Hubbell, Jr., H. H. ^[1]; Birkhoff, R. D. ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The electron flux spectrum resulting from the slowing down of electrons from ⁶⁴Cu uniformly distributed in Cu was measured from 0.1 ev to 37 kev for both a plane disk source and a black body cavity source. The cavity source consisted of a hollow Cu frustrum with walls infinitely thick for ⁶⁴Cu beta rays. A matching thick cover allowed only electrons from inside the cavity to enter the Keplertron, a spherical electrostatic beta spectrometer. The cavity data agreed well from 1 kev to 37 kev with a simplified calculation of the Spencer-Fano theory. Below 1 kev, the experimental flux exceeded the calculated flux by as much as 35% at 30 ev. A stopping power derived from proton dath was used in the theory for electrons below 5.5 kev. A buildup of several orders of magnitude in the electron flux below 1 kev was observed. The disk data was lower than the cavity data at all energies above 1 kev, the former approaching the latter at higher energies. The beth spectrometer was calibrated for transmission and resolution from 1.5 ev to 3 kev using an isotropic electron gun and at 31.4 kev using the /sup 152/Sm Auger line.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-18-020732
• OSTI ID: 4013288
• Report Number(s): ORNL--3463
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
BETA PARTICLES
BETA SPECTROMETERS
BETATRONS
COPPER
COPPER 64
DISTRIBUTION
ELECTRIC FIELDS
ELECTRONS
ENERGY
ENERGY RANGE
ERRORS
GAMMA RADIATION
MEASURED VALUES
NUMERICALS
RADIATION SOURCES
RESOLUTION
SAMARIUM 152
SLOWDOWN
SPECTRA
SPENCER-FANO METHOD
SPHERES
STANDARDS
THICKNESS