A variable energy (3-7 MeV) and pulsed current (0.1 –
100 µA) proton beam has been made available for
different applications (radiobiology experiments,
detectors development, material studies) in an irradiation
facility at ENEA-Frascati based on the 7 MeV injector of
the proton-therapy linac under realization in the
framework of the TOP-IMPLART Project. It is a 425
MHz linear accelerator consisting in a 3 MeV RFQ
followed by a DTL up to 7 MeV (PL-7
ACCSYSHITACHI model) followed by an horizontal and
a vertical beam transport line. The latter one is
particularly suitable for radiobiology in vitro studies
allowing to irradiate besides cell monolayers also cell
growing in suspension culture. The paper describes the
facility and the recent results of the experimental activity