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Thermoluminescence detectors (TLD) were used for dose measurements at JET.Several hundreds of LiF detectors of various types, standard LiF:Mg,Ti andhighly sensitive LiF:Mg,Cu,P were produced. LiF detectors consisting of naturallithium are sensitive to slow neutrons, their response to neutrons beingenhanced by 6Li-enriched lithium or suppressed by using lithium consistingentirely of 7Li. Pairs of 6LiF/7LiF detectors allow distinguishing betweenneutron/non-neutron components of a radiation field. For detection of neutronsof higher energy, polyethylene (PE-300) moderators were used. TLDs, located inthe centre of cylindrical moderators, were installed at eleven positions in theJET hall and the hall labyrinth in July 2012, and exposure took place duringthe last two weeks of the experimental campaign. Measurements of the gamma dosewere obtained for all positions over a range of about five orders of magnitudevariation. As the TLDs were also calibrated in a thermal neutron field, theneutron fluence at the experimental position could be derived. The experimentalresults are compared with calculations using the MCNP code. The results confirmthat the TLD technology can be usefully applied to measurements of neutronstreaming through JET Torus Hall ducts.

Thermoluminescence measurements of neutron streaming through JET Torus Hall ducts