@article{oai:repo.qst.go.jp:00049556,
 author = {George, S.P. and Kroupa, M. and Wheeler, S. and Kodaira, S. and Kitamura, H. and Tlustos, L. and T., Campbell-Ricketts and Stoffle, N.N. and Semones, E. and Pinsky, L. and Kodaira, Satoshi and Kitamura, Hisashi},
 issue = {11},
 journal = {Journal of Instrumentation},
 month = {Nov},
 note = {We investigate energy measurements in Timepix hybrid detectors in hole collection mode
above pixel input energy depositions of about 2:2 MeV or 600,000 electron/hole pairs in Silicon. Measurement of the detector response well above this regime is important for our application
measuring the heavy ion exposure of NASA astronauts. We find that high input charges produce
a double pulse structure in the Timepix front end which creates a taxonomy of different clusters
which are observed at accelerators, but not in typical operation on orbit. We investigate the LET
response of the Timepix to different heavy ion species and find that for a given polar angle the so called ‘volcano effect’ can be compensated with a simple power law model. We also characterize the pixel response of the Timepix using mono-energetic stopping protons and derive a per pixel calibration method for correction of the pixel response up to about 8 MeV. We conclude that with an appropriate calibration procedure the Timepix can correctly measure the LET values in excess of 500 keVμm????1 in Silicon for tracks with a polar angle exceeding 60°, corresponding to the entirety of the cosmic ray spectrum up to Nickel.},
 title = {Very high energy calibration of silicon Timepix detectors},
 volume = {13},
 year = {2018}
}