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How much Cu-64 would remain from a 2 mg sample after 12 hours?

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Updated: 9/25/2023

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How much cu64 would remain from a 2mg sample after 12 hours?

To determine how much Cu-64 would remain after 12 hours, we need to know its half-life, which is approximately 12.7 hours. After 12 hours, the amount remaining can be calculated using the formula ( N = N_0 \times (0.5)^{t/T_{1/2}} ), where ( N_0 ) is the initial amount, ( t ) is the time elapsed, and ( T_{1/2} ) is the half-life. Since 12 hours is just below one half-life, approximately 75% of the original 2 mg would remain, resulting in about 1.5 mg of Cu-64 after 12 hours.

If you bind an antibody with an isotope eg Cu 64 Is this considered a radiopharmaceutical or is the Cu the radiopharmaceutical?

A radiopharmaceutical is that copmound which contains a radiocative nuclide within and can be used safely for diagnosis or treatment of an abnormal state or a disease state. According to this accepted definition of a radiopharmaceutical, the answer should be, yes , an antibody bound Cu64 can be considered a radiopharmaceutical.

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