McEwen, M R; Burns, D T; Williams, A J (1993) The use of thermistors in the NPL electron-beam calorimeter. NPL Report. RSA(EXT)41

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Abstract

Thermistors have been employed in the primary standard electron-beam graphite calorimeter for several years. This report describes the system developed for calibrating thermistors and the results of investigations into self-heating and dose response. The overall uncertainty in measuring temperature rises is estimated to be ± 0.1 % at the 95% confidence level. The self-heating of the thermistor type used in the calorimeter was determined to be constant over the temperature range 14-29 °C. The same thermistor type showed no change in response within the uncertainties to an accumulated dose up to 3000 kGy. A second type of thermistor (to be used in a new calorimeter) showed no change in sensitivity although there was a change in absolute resistance of approximately 0.1% per MGy.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	RSA(EXT)41
Subjects:	Ionising Radiation Ionising Radiation > Dosimetry
Last Modified:	02 Feb 2018 13:19
URI:	https://eprintspublications.npl.co.uk/id/eprint/3425