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Several primary veins diverging from a point.

Which letter points to the spore producing structures of a mushroom?

In annihilation coincidence detection (ACD) circuitry a logic pulse is generated when a detector detects a signal from a gamma-ray photon.

Radiopharmaceuticals are compounds consisting of a chemical substrate linked to a radioactive element.

The finite distance which the positron travels before annihilation with an electron defines a sphere of uncertainty in SPECT.

The iterative algorithm of image reconstruction for CT scans starts with an initial estimate of the two-dimensional matrix of attenuation coefficients.

In PET scan, a pair of gamma-ray photons are created simultaneously and always detected at exactly the same time.

The gamma-ray photons generated for PET scan are from isomeric transition.

A sample contains 9879432567 atoms.  If 60 atoms of the sample decay in 5 s, what is the radioactivity of the sample?   

The notation 68Zn(p,2n)67Ga indicates that Gallium-67 is produced in a process that a target material zinc-68 is bombarded with a proton and emits two neutrons.