AN ADIABATIC CALORIMETER FOR HIGH PRECISION SOURCE STANDARDIZATION AND DETERMINATION OF W (AIR)

Technical Report · Wed Mar 01 04:00:00 EST 1961

OSTI ID:4089482

Myers, I T; LeBlanc, W H; Fleming, D N; Wyekoff, H O

The measurement of the energy output of a Co/sup 6//sup 0/ source with a total absorption calorimeter is discussed. An adiabatic calorimeter designed for high precision source standardization is described. The bath temperature control circuit and the thermistor resistance measuring circuit are shown. All resistance changss and heat capacity measurements were corrected to a standard thermistor resistance. Correction for energy escaping from the calorimeter was made by using an ionization chamber instrument to measure the leakage flux. The source ac tivity of a National Bureau of Standards Co/sup 6//sup 0/ source was found to be 0.5012 plus or minus 0.0020 curies. The exposure dose rate was measured as 0.756 roentgens per hour. The energy to produce an ion pair in air was calculated to be 33.84 plus or minus 0.34 ev. (M.C.G.)

• Research Organization: General Electric Co. Hanford Atomic Products Operation, Richland, Wash.; National Bureau of Standards, Washington, D.C.
• DOE Contract Number: AT(45-1)-1350
• NSA Number: NSA-15-020847
• OSTI ID: 4089482
• Report Number(s): HW-SA-2165
• Country of Publication: United States
• Language: English

Related Subjects

CALORIMETERS
ENGINEERING AND EQUIPMENT