A NEW METHOD FOR THE REDUCTION OF ALPHA-RAY BACKGROUND IN A GRIDDED IONIZATION CHAMBER

Journal Article · Tue May 01 04:00:00 EDT 1962 · Canadian Journal of Physics (Canada)

DOI:https://doi.org/10.1139/p62-062· OSTI ID:4830481

Doke, T

By making use of grid pulses in a double-gridded ionization chamber, it was attempted to eliminate the background pulses caused by the alpha particles emitted from electrodes other than the cathode. Operating conditions for the reductions of the background in this method were investigated analytically. Using the double-gridded chamber of a parallel-plate type with a maximum sample area of 80 cm/sup 2/ for alpha particles of 9 Mev, a background counting rate of one count per hour was achieved in the energy region from 3.5 to 9 Mev. It was found that an insulator like polyethylene could be used as a sample base with a good resolution for very weak activity. Spectra of weak alpha activities were measured by the present method. For the purpose of practical applications, the construction of a cylindrical double-gridded chamber is proposed. (auth)

• Research Organization: St. Paul's Univ., Tokyo
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-019085
• OSTI ID: 4830481
• Journal Information: Canadian Journal of Physics (Canada), Journal Name: Canadian Journal of Physics (Canada) Vol. Vol: 40; ISSN CJPHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA PARTICLES
BACKGROUND
CATHODES
CYLINDERS
ELECTRODES
ENERGY LEVELS
ENGINEERING AND EQUIPMENT
IONIZATION CHAMBERS
POLYETHYLENES
RESOLUTION
SHIELDING