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Total biologically weighted dose rate in the adjacent normal tissue near moderator balloon, which had its radial surface located at 2.25–6.25 cm depth at 432 μg californium-252 (252Cf) source. Cf-BNCT, 252Cf brachytherapy combined with boron neutron capture therapy; Cf-BNCT-HWB, Cf-BNCT combined with a moderator balloon filled with heavy water; Cf-BNCT-LWB, Cf-BNCT with balloon filled with light water.
