Working with a power limit of 30 watts was very challenging, and a device was delivered but it wasn’t used. Later NASA developments did lead to an X-ray spectrographic unit that did make the desired moon soil analysis. The Norelco efforts faded but the use of X-ray spectroscopy in units known as XRF instruments continued to grow. With a boost from NASA, units were finally reduced to handheld size and are seeing widespread use. Units are available from Bruker, Thermo Scientific, Elvatech Ltd. and SPECTRA. Other types of X-ray spectroscopy X-ray absorption spectroscopy X-ray magnetic circular dichroism See also Auger electron spectroscopy X-Ray Spectrometry (journal) New perspectives of explosive detection based on CdTe/CDZnTe spectrometric detectors References