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The gamma activity of a number of tiles from inside the JET vacuum vessel was measured. Most of the detected activity was from isotopes of cobalt which were produced following neutron irradiation of the securing clips. Gamma emission from 7Be was also detected from both beryllium and carbon tiles, following the impact of high energy electrons. The cobalt activity was found to be uniform throughout the vessel at a level consistent with the known neutron emission from the preceding operating period. The 7Be activity was uniform toroidally but, in a scan of the upper x-point tiles, the activity was found to be most intense on the innermost tiles, by a factor of approximately 3.

Additional information

Authors: LOUGHLIN M J, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(94)01 EN (1994) 23 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199410321 / Last updated on: 1994-11-28
Original language: en
Available languages: en