Abstract: A device (1) for collecting ionizing radiation comprises a scintillating optical fiber (4) received in an opaque sheath, having a first end (7) for receiving ionizing radiation and a second end (14), the fiber is arranged to convert the ionizing radiation received via its first end into light signals and to deliver the signals via its second end. The device further comprises filter elements (9) placed at the first end (10) of the sheath (3) to prevent external photons (&ngr;) and gamma type (&ggr;) ionizing radiation from gaining access to the first end (7) of the scintillating fiber (4), and at the second end (14) of the scintillating fiber (4), first connection elements (16) suitable for connection to light guide elements (2) for enabling the second end (14) of the fiber to be coupled to the end (17) of a light guide (18) of the light guide elements.

Abstract: An apparatus for sensing and locating sources of ionizing radiation retained in a turnout in a body environment, including a hand-held probe and comprising a housing with a sensor circuit for outputting a response to interaction between the radiation and the sensor; a unit for processing signals from the sensor circuit; and an indicator responding to driving signals applied thereto by generating an audible or visual output. Said hand-held probe comprises at least one scintillating plastic optical fibre (2) connecting the sensing end to a light sensor (1).