Ruggedized high temperature compatible radiation detector

An apparatus configured to detect radiation at high temperatures in a borehole penetrating the earth, the apparatus comprising:

• a downhole tool configured to be conveyed through the borehole;
• a scintillation material that interacts with the radiation at the high temperatures to generate photons;
• at least one solid-state photodetector optically coupled to the scintillation material and configured to detect the radiation by detecting the generated photons;
• and
• at least one optical element disposed between the scintillation material and the at least one solid-state photodetector and configured to concentrate the photons generated in the scintillation material onto the at least one solid-state photoconductor;
• wherein the scintillation material, the at least one solid-state photoconductor, and the at least one optical element are disposed on the downhole tool.