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A facility for radiation hardness studies based on a medical cyclotron
Ist Teil von
Journal of instrumentation, 2022-04, Vol.17 (4), p.P04021
Ort / Verlag
Bristol: IOP Publishing
Erscheinungsjahr
2022
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Abstract
The development of instrumentation for operation in
high-radiation environments represents a challenge in various
research fields, particularly in particle physics experiments and
space missions, and drives an ever-increasing demand for irradiation
facilities dedicated to radiation hardness studies. Depending on the
application, different needs arise in terms of particle type, energy
and dose rate. In this article, we present a versatile installation
based on a medical cyclotron located at the Bern University Hospital
(Inselspital), which is used as a controlled 18-MeV proton
source. This accelerator is used for daily production of medical
radioisotopes, as well as for multidisciplinary research, thanks to
a 6.5-meter long beam transfer line that terminates in an
independent bunker, dedicated only to scientific activities. The
facility offers a wide range of proton fluxes, due to an adjustable
beam current from approximately 10 pA to the micro-ampere range,
together with a series of steering and focusing magnets along the
beamline that allow for the beam spot to be focused down to a few
mm^2. The beamline can be instrumented with a variety of beam
monitoring detectors, collimators, and beam current measurement
devices to precisely control the irradiation conditions. The
facility also hosts a well equipped laboratory dedicated to the
characterisation of samples after irradiation. An experimental
validation of the irradiation setup, with proton fluxes ranging from
5×10^9 cm^-2s^-1 to
4×10^11 cm^-2s^-1, is reported.