Absorbed dose water calorimeter

Details Absorbed dose water calorimeter Absorbed dose water calorimeter

1980-02-29

1982-01-26

Gill, James J.

Measuring and testing

Volume or rate of flow

System

250352, G01K 1700, G01T 116

Patent

active

043122248

ABSTRACT:
An absorbed dose water calorimeter that takes advantage of the low thermal diffusivity of water and the water-imperviousness of polyethylene film. An ultra-small bead thermistor is sandwiched between two thin polyethylene films stretched between insulative supports in a water bath. The polyethylene films insulate the thermistor and its leads, the leads being run out from between the films in insulated sleeving and then to junctions to form a Wheatstone bridge circuit. Convection barriers may be provided to reduce the effects of convection from the point of measurement. Controlled heating of different levels in the water bath is accomplished by electrical heater circuits provided for controlling temperature drift and providing adiabatic operation of the calorimeter. The absorbed dose is determined from the known specific heat of water and the measured temperature change.

REFERENCES:
patent: 2802986 (1957-08-01), Chase et al.
patent: 3670570 (1972-06-01), Briones
"A Liquid Calorimeter for High-Energy Lasers", by Damon et al., from Applied Optics, vol. 2, No. 2, Feb. 1963, pp. 163-164.

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