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  • 1 Jožef Stefan Institute Department of Environmental Sciences Jamova 39 P.O. Box 3000 SI-1000 Ljubljana Slovenia
  • | 2 International Atomic Energy Agency Division of Human Health Wagramer Strasse 5 P.O. Box 100 A-1400 Vienna Austria
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The neutron distribution in a defined volume (gradient) for different matrices (air, water, cellulose, biological material and silicon dioxide) in two typical irradiation channels (pneumatic tube (PT) and IC40-channel in the carousel facility) in the TRIGA Mark II reactor at the Joef Stefan Institute (IJS) was studied. Our experiment was based on inserting Fe wires (flux monitors) into the chosen matrices. The wires were cut into small pieces after irradiation and the induced activities of 59Fe measured. The results showed that for the studied geometry the average spatial thermal neutron flux inhomogeneities (for five studied matrices) are about 2.3% in the PT-channel and about 2.9% in the IC40-channel.