A bone implant composition, the composition comprising calcium sulphate and slowly soluble source of calcium, orthophosphate and hydroxyl ions. A system may include an illumination system configured to direct a first beam of light to a surface of the specimen at an oblique angle of incidence and to direct a second beam of light to a surface of the specimen at a substantially normal angle. A method for using the getter device includes providing a vacuum chamber and automatic handling equipment, loading the device into the chamber, reducing the chamber pressure to a desired value by using the getter device in conjunction with an external pump, removing the getter device and replacing it with a substrate, and depositing a thin film on the substrate. The method alternates between these two modes of operation until all of the output tuples satisfying the query condition are enumerated. The photoelectric conversion circuit is connected to an optical connection part so that data transmission between the boards is performed through the optical transmission circuit. The method also includes floating the voltage level of a source region and a drain region of the memory cell, wherein the source region and the drain region are located within the tank region and have the second conductivity type.