TEMN Medicina Nuclear Practice Questions - TEMN - Título De Especialista Em Medicina Nuclear (Sociedade Brasileira De Medicina Nuclear AMB) Exam

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In a clinical molybdenum-99 / technetium-99m (99Mo/99mTc) generator system, the parent radionuclide 99Mo has a physical half-life of 66.0 hours and the daughter 99mTc has a half-life of 6.0 hours. What type of radioactive equilibrium is established, and approximately how many hours after elution does maximum 99mTc activity occur?

Secular equilibrium; maximum daughter activity is reached at 48 to 72 hours. Transient equilibrium; maximum daughter activity is reached at approximately 23 hours. Transient equilibrium; maximum daughter activity is reached at exactly 6 hours. No equilibrium; daughter activity decreases continuously without reaching a maximum.

Correct Answer:

Transient equilibrium; maximum daughter activity is reached at approximately 23 hours.

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