“…The rings being contacted with NaOH would be continued dissolving by H 2 O 2 as shown in this dissolution test. Furkina et al[9] recently demonstrated a H 2 O 2 dissolution of a cyclotron irradiated W metal target in caustic solution up to 3M NaOH. It proves that W dissolution by H 2 O 2 can be conducted in caustic liquid.…”