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Journal Articles IEEE Transactions on Nuclear Science Year : 2018

Tests and foreseen developments of fibered-OSLD gamma-heating measurements in low-power reactors

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Abstract

In this paper, test measurements of a fibered optically stimulated luminescent dosimeter (OSLD) system performed during a dedicated experimental phase in EOLE zeropower reactor are presented. The measurement setup consists of an OSLD crystal connected onto the extremity of an optical fiber and a laser stimulation system, manufactured by the CEA/LIST, Saclay, France. The OSL sensor is remotely stimulated via an optical fiber using a diode-pumped solid-state laser. The OSL light is collected and guided back along the same fiber to a photomultiplier tube through appropriate optical filters. OSL signals are corrected for background noise and integrated to provide the absorbed doses thanks to calibration coefficients. The light stimulation also fully bleaches the crystal (reusable for the next measurement). Results obtained using this system are compared to usual gamma-heating measurement protocol using OSLD pellets. Both measurement processes were calibrated to ensure the comparison of absolute doses in gray at the same positions in the core. The presence of induced radioluminescence in the OSLD during the irradiation was also observed and could be used to monitor the gamma flux. The feasibility of remote measurements is achieved, whereas further developments could be conducted to improve this technique since the readout procedure still requires to withdraw the OSLD off the gamma flux (hence from the core) on account of the dose rate (around a few Gy·h$^{-1}$ ), and the readout time remains quite long for online applications. Several improvements are foreseen and will be tested in the forthcoming years.

Dates and versions

cea-01917204 , version 1 (09-11-2018)

Identifiers

Cite

A. Gruel, M. Le Guillou, Patrick Blaise, C. Destouches, S. Magne. Tests and foreseen developments of fibered-OSLD gamma-heating measurements in low-power reactors. IEEE Transactions on Nuclear Science, 2018, 65 (9), pp.2490 - 2493. ⟨10.1109/TNS.2018.2827393⟩. ⟨cea-01917204⟩
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