Natural Sources of Neutron Radiation! I detect neutrons from thermal to as high as 14 MeV! [Neutron Detector/Gamma Spectrometer] http://www.polimaster.us/products/spectroscopic_personal_radiation_detectors/pm1703mb/ [PoliSmart Dosimeter] http://www.polimaster.us/products/electronic_dosimeters/pm1904a_/