Carbon resistors as low temperature sensors in low temperature reactor irradiation experiments

✍ Scribed by G. Wehr; G. Sieber; K. Böning

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 287 KB
• Volume: 17
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(77)90305-8

✦ Synopsis

We have irradiated several Allen Bradley carbon resistors (type BB, 1/8 W) at 4.6 K in a reactor up to a dose of 3 x 109 r gammas and 2.5 and 2.0 x 10 la cm -2 thermal and fast neutrons respectively. A significant change of the R(T) characteristics is observed after irradiation and after subsequent annealing. For accurate temperature measurements allowance must be made for sufficient radioactivity decay time. A calibration procedure which is particularly suitable for high precision thermopower experiments is also reported.

Carbon resistors as low temperature sensors in low temperature reactor irradiation experiments G. Wehr, G. Sieber, and K. Boning Commercial carbon resistors (CR) have been widely used as low temperature thermometers for more than twenty years, (for a review see Anderson 1). Their special advantages are high sensitivity, good reproducibility, small size, and a very low price. So they are extremely convenient for accurate temperature measurements as required, for example, in thermopower or thermal conductivity experiments. In the temperature range from 1.3 to 15 K, carbon resistors manufactured by Allen-Bradley (type BB, 1/8 W) exhibit the most favourable thermometric characteristics. ~ '2