The biological half-life of ¹³¹I in a particular patient is 30 days.The physical half-life is 193 hours.If the patient's thyroid is counted with the thyroid probe detector, what effective half-life will be observed?

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Typically the patient's organ excretes the radiopharmaceutical with some biological half-life t_B while the radioactivity also decays physically with a physical half-life that is denoted as t_P.The counts observed by the gamma camera follow an exponential decay law based on the effective half-life t_E, where: 11ea6816_3f26_fb97_b611_2fd31edcbc3a_TB6242_00 or in a format that is much easier for calculation purposes, 11ea6816_3f26_fb98_b611_a9c678028124_TB6242_11 The effective half-life is always less than or equal to the smaller of t_P or t_B.

The Biological Half-Life of 131I in a Particular Patient Is

The Biological Half-Life of ¹³¹I in a Particular Patient Is