Properties of CdTe(Cl) crystal used for radiation detector

A new method is described for growing CdTe crystals doped with chloride by using a radiofrequency traveling heater method (THM) which can provide excellent uniformity for the Cl atoms in the crystal. The relationship between response characteristics by gamma -ray detection and crystal properties studied by photoluminescence (PL) measurements is discussed. In the RF-THM crystal sample, the emission intensity ratios between the 1.5932 eV and 1.5905 eV lines due to bound excitons from chlorine are nearly constant for all parts of one ingot. From this result, it is suggested that the Cl atoms are uniformly distributed through the whole of the crystal. Using crystals grown by this method, a large number of high-quality radiation detectors which exhibit the same characteristics can be produced from one CdTe ingot.<
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