氚

氚 (radical 84, 气+3, 7 strokes, cangjie input 人弓中中中 (ONLLL), four-corner 8021₇, composition ⿹气川)

• KangXi: not present, would follow page 599, character 4
• Hanyu Da Zidian: volume 3, page 2010, character 8
• Unihan data for U+6C1A

Ideogrammic compound (會意) : 气 (“gas”) + 川 (“three”). Also a phono-semantic compound (形聲) , where 川 (chuān) acts as the phonetic component. Compare 氘 (“deuterium”) and 氚 (“tritium”).

From 川 (chuān) from the glyph, possibly influenced by New Latin tritium. In Mandarin, it is pronounced in the first tone by analogy with 氕 (piē, “protium”) and 氘 (dāo, “deuterium”).

氚

1. tritium

• 超重氫／超重氢 (chāozhòngqīng)

• 氕 (piē, “protium”)
• 氘 (dāo, “deuterium”)
• 氫／氢 (qīng, “hydrogen”)