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thorium C'
gen. 钍 C' (针的同位素)
earth.sc. 钍 C' (针的同位素 Po212)
thorium C
gen. 钍 C (秘的同位素)
thorium C"
gen. 钍C"铊的同位素
thorium C
earth.sc. 钍 C (铋的同位素 Bi²¹²)
thorium C"
earth.sc. 钍 C"铊的同位素 Tl²⁰⁸