A delivery system and method for interstitial radiation therapy comprising a substantially axially stiff and longitudinally flexible elongated strand made of material, which is bio-absorbable in living tissue and a plurality of radioactive seeds dispersed in a predetermined array within the strand. The connector receptacle includes integral alignment features for mating with the connector plug upon insertion of the battery pack into the electronic device. According to another embodiment of the present invention, an administrative serve is provided to select a server system which is low in load from among plural server systems controlling virtual servers as a server system for erasing information stored in the virtual disk allocated to the virtual server to be deleted. An optimal RLP packet-size that corresponds to the processed channel condition metric is chosen. When one of the functions breaks down, a user just replaces the electronic fire-control assembly, instead of spending time and effort to inspect, disassemble, and re-assemble the toy gun.