A variable temperature cryostat for the thermoluminescence studies

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Abstract
A simple and inexpensive variable-temperature liquid-nitrogen cryostat is described which has been in operation for sample temperature control in the studies on post-irradiation thermoluminescence of biomolecules in the range 77 K to room temperature. Arrangements are incorporated to raise the temperature of the sample chamber from 77 K at a desired rate by varying the electrical input to the sample heater. The sample holder can also be stabilized at any temperature between 77 K and room temperature in a short time and maintained at that temperature over long periods of time. Although of simple construction the cryostat is economical of liquid nitrogen and has been found to have many advantages for thermoluminescence investigations.