Superconducting Tunnel Junctions (STJs) are amongst the more energy sensitive cryogenic detectors. They are amazingly versatile, being able to measure the energy released both by ionizing and non-ionizing particle/radiation. As a result, the application of STJ detectors are wide ranging, from the detection of X-ray in radioastronomy and the measurement of single optical photon counting to the industrial X-ray fluorescence analysis and biopolymer mass spectrometry.
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