Gresham Scientific Instruments Leading Edge X-ray Detectors Gresham’s specialist team producing these products includes members involved throughout the history of this technology. A combination of this experience together with new staff members ensures the best use of the latest materials and techniques. The Sirius range of detectors covers the full range technologies including: Lithium drifted Silicon, High purity Silicon and High Purity Germanium. Sirius are made from the highest quality silicon. A radical new approach to lithium compensation together with refinements in contacts and silicon processing produce the best specifications in the industry COOLING - A 7.5 litre dewar is fitted as standard, 2.8 litre high performance dewars can be supplied. Peltier cooling and cryo gas recirculating systems are also available.