Abstract
Scintillators belong to the oldest types of radiation detectors. Nowadays, for spectrometric purposes the use of semiconductive detectors is more common, but scintillation detectors are still in use for various specific measurement purposes. We have investigated the dependence of a gamma spectrum measured by NaI(Tl) scintillation detector on temperature changes. We examined the need of energy or efficiency recalibration and software compensation. Due to temperature dependence, scintillation detectors require energy recalibration before environmental and outdoor measurements or before the use of etalon sources for obtaining spectrum for follow-up calibration. We have elaborated on a simple method for energy recalibration of scintillation detectors at different temperatures. This method was converted into an algorithm and it can be either burned into instrument EPROM or used in software processing.
Highlights
Some of the oldest detection techniques of nuclear radiations are based on the observation of flashes, or so called “scintillations”
In this study we have investigated the dependence of the gamma spectrum measured by a NaI(Tl) scintillation detector on temperature changes
To handle thermal impact on the spectra, continuous temperature monitoring of the detector is required; measuring the temperature is effective if the thermal equilibrium is established during the recording spectrum
Summary
Some of the oldest detection techniques of nuclear radiations are based on the observation of flashes, or so called “scintillations”. Nowadays the flashes are observed not with bare eyes but with the use of electronic data processing devices connected to photoelectron multipliers. These instruments can detect even very weak flashes and generate electric pulses proportional to the strength of light. Uncertainty of the Peak Intensity ∆IN [cps]. The shifting, migration of the spectra’s gamma peak centroids in the function of the temperature can be seen on the following diagram Fig. 3. The net intensity of the 662 keV 137Cs peak had only negligible changes (Fig. 4).
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