Prof. Christer Fröjdh

Radiation detector research at Mid Sweden University

Mittuniversitetet

Resources

• Cleanroom for detector processing• Class 1000, 4 inch wafers• Lithography, heat treatment, metallization,

etching ..

• Radiation lab• Nanofocus X-ray source – 160 kVp• Radioactive sources• Different spectroscopic and imaging detectors

• Simulation• Radiation interaction and charge transport• MCNP, Geant4, MEDICI …

Mittuniversitetet

Single particle processing detectors

• Member of the MEDIPIX collaboration since 2000• MEDIPIX3 – spectral X-ray imaging with on chip

charge summing• TIMEPIX3 – event driven pixel detector with time

and energy information per pixel

• Common features• Hybrid pixel detectors

• Silicon and High-z materials• Neutron converters could be applied

• 256 x 256 pixels with a pitch of 55 um• Energy bins or energy per event• Tiling to make large areas

Mittuniversitetet

Neutron detectors

• 3D neutron detector structures• Etching of pores in silicon• Wall preparation to form junctions• Filling with neutron converter• Readout using TIMEPIX3

• Scintillator based neutron detectors using scintillating guides screens

• Scintillator filled pores in silicon• Readout using photosensitive pixel

detectors

Mittuniversitetet

Main activities at Mid Sweden University

• Simulation• Geant4 based framework for simulation

of radiation interaction, charge transport and electronics behavior

• Processing• Processing of detector modules

• Characterisation• Charge sharing and signal formation in

hybrid pixel detectors • Fundamentals of spectral X-ray imaging

• Material separation• Properties of different sensor materials