Members of our team are working in collaboration with the
Brookhaven National Laboratory on a Silicon Drift Detector (SDD) Array for eventual
use on lunar missions to perform remote elemental mapping of the lunar surface
using X-ray fluorescence. The prototype array consists of hexagon-shaped pixels,
each with 15 mm2 surface area, acting as independent n-type drift detectors
with a central collecting anode. The anode of each pixel is coupled to the input
of a 14-channel application specific integrated circuit (ASIC).
The ASIC is also being designed in collaboration with BNL.
The readout is done by wire-bonding the anodes to the inputs of the ASIC.
The complete 14-pixel unit covers an area of 210 mm2 and can be tiled to cover an arbitrarily large detection area. A preliminary resolution of 172 eV at the 6 keV peak of 55Fe has been measured.
Here is the paper
Development of Thin-Window Silicon Drift Detector for X-ray Spectroscopy from the
IEEE 2007 Nuclear Science Symposium and the paper
Front-End ASIC for High Resolution X-Ray Spectrometers from the June 2008 issue
of IEEE Transactions on Nuclear Science.