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|Title:||A Low-level Activation Technique for Monitoring Thermonuclear Fusion Plasma Conditions|
|Authors:||GASPARRO JOEL; HULT MIKAEL; BONHEURE Georges; JOHNSTON Peter N.|
|Citation:||APPLIED RADIATION AND ISOTOPES vol. 64 no. 10-11 p. 1130-1135|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Type:||Contributions to Conferences|
|Abstract:||Optimisation of the confinement and sustainability of a thermonuclear plasma requires methods to monitor processes in the plasma. In this work three materials were used as activation targets (Ti, MgF2 and a TiVAl compound). They were placed inside the joint European Torus (JET) vacuum chamber. Certain gamma-ray emitting radionuclides (7Be, 54Mn, 56Co, 57Co, 58Co and 46Sc) were measured using ultra low-level gamma-ray spectrometry in an underground laboratory 1–2 months after ctivation. They were found to arise from neutron activation of bulk sample material and surface contaminants sputtered from other Tokamak parts. Decision thresholds for some activation products were determined in order to aid in giving upper bounds for the flux of charged particles. r 2006 Elsevier Ltd. All rights reserved. Keywords: Ultra low-level gamma-ray spectrometry; Thermonuclear fusion; Underground laboratory; Charged particles; Activation|
|JRC Institute:||Institute for Reference Materials and Measurements|
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