The radiation effects (total dose) on both the QPLL and the Crystal have been evaluated for neutrons and gamma rays.
The irradiation test results are summarized in the presentation: "QPLL - Irradiation tests & Status."
Detailed irradiation data can be found on the file: "QPLL2 irradiation data."
Because the QPLL2 frequency shift with irradiation can be perfectly correlated with the bandgap voltage shift, a short account of the phenomena is given on the file: "Radiation effects on the "CERN_Bandgap" circuit"