A brachytherapy treatment apparatus, (10, 110, 210) comprising: an elongate core member (20, 120, 220) comprising proximal (22, 122, 222) and distal (24, 124, 224) ends, a proximal portion (12, 112, 212), and a distal portion (14, 114, 214) configured for introduction into a tract through tissue and terminating in a distal tip; a plurality of elongate members (30, 130, 230), each elongate member comprising a distal end (34, 134, 234) coupled to the core member distal end, a proximal end (32, 132, 232) movable relative to the core member, and a pathway extending between the elongate member proximal and distal ends for receiving a source of radiation therealong, the elongate member proximal ends being movable relative to the distal ends for expanding the elongate members from a collapsed configuration to an expanded configuration such that the elongate members are directed radially outwardly away from the distal portion of the core member; and an expandable member (50, 150, 250) comprising a proximal end (52, 152, 252) coupled to the core member adjacent the elongate member proximal ends and a distal end (54, 154, 254) coupled to the distal tip of the core member such that the expandable member surrounds the distal portion of the core member, the elongate members extending along an outer surface of the expandable member in the collapsed configuration, and the expandable member (50, 150, 250) being expandable independently of the elongate members such that the elongate members may be expanded away from the expandable member before the expandable member is expanded, the apparatus characterized in that: the expandable member (50, 150, 250) is expandable after expanding the elongate members (30, 130, 230) such that the expandable member expands outwardly towards and contacts the expanded elongate members. an elongate core member (20, 120, 220) comprising proximal (22, 122, 222) and distal (24, 124, 224) ends, a proximal portion (12, 112, 212), and a distal portion (14, 114, 214) configured for introduction into a tract through tissue and terminating in a distal tip; a plurality of elongate members (30, 130, 230), each elongate member comprising a distal end (34, 134, 234) coupled to the core member distal end, a proximal end (32, 132, 232) movable relative to the core member, and a pathway extending between the elongate member proximal and distal ends for receiving a source of radiation therealong, the elongate member proximal ends being movable relative to the distal ends for expanding the elongate members from a collapsed configuration to an expanded configuration such that the elongate members are directed radially outwardly away from the distal portion of the core member; and an expandable member (50, 150, 250) comprising a proximal end (52, 152, 252) coupled to the core member adjacent the elongate member proximal ends and a distal end (54, 154, 254) coupled to the distal tip of the core member such that the expandable member surrounds the distal portion of the core member, the elongate members extending along an outer surface of the expandable member in the collapsed configuration, and the expandable member (50, 150, 250) being expandable independently of the elongate members such that the elongate members may be expanded away from the expandable member before the expandable member is expanded, the apparatus characterized in that: the expandable member (50, 150, 250) is expandable after expanding the elongate members (30, 130, 230) such that the expandable member expands outwardly towards and contacts the expanded elongate members. the expandable member (50, 150, 250) is expandable after expanding the elongate members (30, 130, 230) such that the expandable member expands outwardly towards and contacts the expanded elongate members.