Differential thermoluminescence (DTL) -a new instrument for measurement of thermoluminescence with suppression of blackbody radiation.
A new instrumental technique for the determination of thermoluminescent glow curves, especially useful for investigation at high temperatures, is described. Two samples, identical in all respects except that one is preheated, are simultaneously heated. The light outputs from the samples are individually modulated at two different frequencies, fed to a single photomultiplier tube the output of which is amplified by two lock-in amplifiers. The selectively amplified signals are further fed to a differential amplifier which cancels out the undesirable blackbody radiation to give a signal due only to the luminophor. This technique conveniently extends the temperature range of thermoluminescence and further allows high-temperature investigation of emissions in the red region of the spectrum.
Manche
E P
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Department of Natural Sciences, York College of the City University of New York, Jamaica, New York 11451.