Calculate the exact time at which the first three 'milkings' of the technetium cow should be performed.
Radionuclide generators are devices that produce a useful short-lived medical radionuclide (known as “daughter”) from the radioactive transformation of a non-medical long-lived radionuclide (called a “parent”).
Technetium Cow- A technetium-99m generator, is a device used to extract the metastable isotope 99mTc from a source of decaying molydenum-99.
Milking - For generator systems to be practical, the parent must have a relatively long half-life compared to that of the daughter, and the generator device (often referred as a "cow") must provide for repeated separations of the daughter product. This separation process is called an elution (colloquially it is also referred to as a "milking").
99Mo has a half-life of 66 hours.
Half Life of Tc-99m is 6 hours.
Four half lives = 24 hours.
The first milking process occurs after 24 hours.
Removing the daughter nuclide from the generator is reasonably done every 6 hours or, at most, twice daily in a Mo-99-Tc-99m generator.
2nd milking process after 24 + 6 = 30 hours..
3rd milking process after 30 + 6 = 36 hours.
Calculate the exact time at which the first three 'milkings' of the technetium cow should be performed.
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