線源 せんげん Meanings Noun source of radiation; radiation source Kanji 線 line. Read as セン. 源 source. Read as ゲン. Words containing 線源 小線源治療 (しょうせんげんちりょう) brachytherapy 小線源 (しょうせんげん) radioactive small source Jinuma: Japanese Dictionary · Word lists