Fernandez, AF; Brichard, B; O'Keeffe, S; Fitzpatrick, C; Lewis, E; Vaille, JR; Dusseau, L; Jackson, DA; Ravotti, F; Glaser, M; El-Rabii, H

2008

January

Fusion Engineering And Design

Real-time fibre optic radiation dosimeters for nuclear environment monitoring around thermonuclear reactors

Published

()

gamma radiation dosimeter optical fibre ITER RESEARCH-AND-DEVELOPMENT PARTICLE ACCELERATORS INDUCED ATTENUATION PLASMA DIAGNOSTICS DOSE-RATE PMMA SYSTEMS SENSOR LUMINESCENCE TEMPERATURE

83

1

50

59

The ability of fibre optic sensors to operate in hazardous nuclear environments and their intrinsic immunity to electro-magnetic interference make fibre optic sensing a very promising technology for the future ITER thermonuclear fusion reactor. In this paper, we evaluate fibre optic sensing technology for monitoring radiation dose in the vicinity of ITER during its operation and during the maintenance periods. First, the performance of an OSL dosimeter interrogated remotely using radiation tolerant optical fibres is evaluated both for real-time and integrating measurements for doses exceeding 100 Gy. We demonstrate its satisfactory operation in a mixed gamma neutron field. Second, we discuss the successful calibration of a new scintillating fibre optic radiation probe based on CsI(TI) crystals for operation in the dose-rate range 0.3-3000 mGy/h. The CsI(TI) crystal scintillator is mounted at the end of a 10-m long multimode fibre transceiver link to allow for remote deployment. The probes can detect and measure gamma dose rates ranging from I to 1000 mGy/h. Finally, we investigate the possible use of commercially available PMMA plastic optical fibres as on-line dosimeters upto 34 kGy. The dose measurement is derived from the radiation-induced attenuation in the optical fibre itself. A novel interrogation scheme based on a ratiometric technique is proposed for real-time dosimetry. (c) 2007 Published by Elsevier B.V.

0920-3796

10.1016/j.fusengdes.2007.05.034