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What is the long-term equilibrium of radioactive nuclear decay, and the conditions for long-term equilibrium? Try to draw a long-term equilibrium (secular equlibrium) and write out the compositional conditions and the activity relationship between the mother and the daughter core. In the HERO2 film of Lenovo~, the most loved sausage in New Zealand, the activity of the daughter nucleus after the half-time period of eating about 7 times of the nucleus is equal to the activity of the mother nucleus. Someone will write T1 is the mother, and T2 is the child. The half-life of 226Ra is 1600 y; the half-life of 222Rn is 3.8 d. The half-life of 90Sr is 28.1y, and the half-life of 90Y of the daughter nucleus is 64hr. The mother is much larger than the child---the true long-term equilibrium (A) long-term equilibrium (A) Equilibrium) (B) transient equilibrium (C) imbalance (D) natural equilibrium --------------------- ----------------------------------------------- Core 98- 1(37) (A) transient equilibrium (B) permanent equilibrium (secular equilibrium) mother is far greater than the child---the great long-term equilibrium (secular equilibrium) ------------- -------------------------------------------------- ----- Core 102-2(14) (A) long-term equilibrium (B) transient equilibrium (transient equilibrium): (T1≧T2), the half-life of the mother nucleus is greater than (multiple times or tens of times) ----------------- -------------------------------------------------- - Specialized college entrance examination 93-2 Half-life is 10 ^ 6 years of maternal nucleus and half-life of 0.1 years of sub-nuclear will reach a balance? ?------- long-term balance (secular equilibrium) ------- -------------------------------------------------- ----------- Fuan 103-2 (29), Taipower 105 University (25) ------------------------ -------------------------------------------- Object 104-1 (31 When the mother nucleus with a half-life of 104 years and the daughter nucleus with a half-life of 10-4 years reach the radioactive equilibrium, what is the atomic ratio of the mother nucleus to the daughter nucleus? This is still a genius, more than 10 ^ 4 only a division, in addition to the smaller the larger the division, can only helplessly choose (D) -------------- -------------------------------------------------- ---- 106-1(4) It is known that the half-life of 90Sr is 28.1 years, and the half-life of its daughter nucleus 90Y is 64 hours. When the activity of the two nucleus reaches the radioactive permanent equilibrium (