The RD20 Collaboration has carried out systematic radiation damage stu
dies of prototype silicon microstrip tracking detectors for use in LHC
experiments. Results are presented for dedicated n-side test-structur
es showing the effect of irradiation with photons to 7Mrad and fast ne
utrons to 8x10(13) n/cm(2). Both p-stop and MOS field-plate devices we
re investigated, each having a range of strip geometries in order to d
etermine optimal configurations for long-term viability and performanc
e.