Twin-tube conduction radionuclide calorimeter
The complete calorimeter system used to measure powers from 0.1 W to 2 W of samples 1.5 in. in diameter by 5 in. in length is described. Calorimeter readout is by digital voltmeter. A sensitivity of 1501 mV/W at 1.327 W with on accuracy of 99.9% was obtained. Sample equilibrium time is 4 h. The twin-tube temperature measurement system compensates for thermostat temperature fiuctuations. Thermistors measure the temperature gradient produced by heat flow through a 5-in. length of 1.75-in.-o.d., 0.035-in.-wall brass tube. The thermistors are supplied with a constant operating current by current regulator diodes to simplify and improve operation. sn integral calibration heater surrounds the sample chamber. Reliability is enhanced by all-solid-state design. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N.Mex. (USA)
- DOE Contract Number:
- W-7405-ENG-36
- NSA Number:
- NSA-29-020975
- OSTI ID:
- 4329039
- Report Number(s):
- LA--5475-MS
- Country of Publication:
- United States
- Language:
- English
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