Investigation on F/M material aspects of IRT-Sofia NCT channel

• Filter/moderators made by combination of aluminum and Al2O3 and by combination of aluminum and graphite are investigated.
• The in-phantom performance of IRT-Sofia BNCT beam is estimated to be close to the best beams built until now.
• The BNCT channel that fits best in IRT-Sofia shielding will be able to supply beam suitable for clinical applications.
• The results justify further investigation on Al2O3 and graphite as a part of the IRT-Sofia BNCT channel's filter/moderator.

The filter/moderator area of IRT-Sofia BNCT channel was investigated in this study in order to find a higher radiation resistant material as a suitable substitution for the Teflon®. Two options – Al2O3 and graphite – were investigated. The results show, that both graphite and the Al2O3 can be successfully used as a filter/moderator material at IRT-Sofia. Initial evaluation of the in-phantom performance of the IRT-Sofia BNCT channel was made and merits similar to the best existing ones were found.