Word

HSK	Not in HSK
FREQUENCY	Unknown

放射性同位素 fàng shè xìng tóng wèi sù

放 fàng HSK 3	put, release, free, liberate
射 shè HSK 5	shoot, eject, issue forth, emit
性 xìng HSK 4	nature, character, sex
同 tóng HSK 1	same, similar; together with
位 wèi HSK 3	throne; position, post; rank, status; seat
素 sù HSK 5	white (silk); plain; vegetarian; formerly; normally