It is also possible that the eluate will contain a small amount of Mo-99. Testing for this radionuclide impurity is mandatory for all licensees. While not mandatory to quantify its presence, this simple, rapid, inexpensive test is highly recommended. This is an ideal equilibrium time since the generator is typically eluted every 24 hr, right after equilibrium is reached. This maximizes the yield of pertechnetate removed from the generator.
Isomers can never be isotopes, isotones, or isobars.
In b- decay, an electron is emitted from the nucleus. Gamma rays and X-rays of the same energy have almost identical interactions in matter. There is only negligible change in mass. Any time one half-value layer is removed from between the source and the detector, the intensity reading doubles. This mechanism is also referred to as capillary blockage.