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High Purity Germanium (HPGe)- Detector Fabrication

techniques for the production of ultrapure germanium with impurity levels as low as 1010 atoms/cm3 first were developed in the mid 1970's

starting material is bulk germanium intended for use in the semiconductor industry

impurity levels are progressively reduced by locally heating the material and slowly passing a melted zone from one end of the sample to the other

after many repetitions of this process, impurity levels as low as 109 atoms/cm3

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