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Thermoluminescence measurements of neutron streaming through JET Torus Hall ducts
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
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2014 (English)In: Fusion engineering and design, ISSN 0920-3796, E-ISSN 1873-7196, Vol. 89, no 9-10, 2235-2240 p.Article in journal (Refereed) Published
Abstract [en]

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

Place, publisher, year, edition, pages
2014. Vol. 89, no 9-10, 2235-2240 p.
Keyword [en]
JET Torus Hall, Neutron fluence, Neutron moderator, Thermoluminescence dosimetry, Lithium fluoride, MCNP code
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-235060DOI: 10.1016/j.fusengdes.2013.12.045ISI: 000341335300072OAI: oai:DiVA.org:uu-235060DiVA: diva2:759253
Available from: 2014-10-29 Created: 2014-10-28 Last updated: 2017-12-05Bibliographically approved

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Conroy, Sean

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