When the radioactive nuclide 
undergoes positron emission,what is the product nuclide?
Definitions:
Masseter
A facial muscle that plays a major role in the chewing of food by raising the lower jaw towards the upper jaw.
Quadriceps Femoris
The quadriceps femoris is a group of four muscles located at the front of the thigh, responsible for extending the knee and stabilizing the patella.
Anterior Thigh
The anterior thigh refers to the front part of the thigh, encompassing muscles like the quadriceps, which are responsible for knee extension.
Biceps Femoris
A muscle of the thigh part of the hamstring group, important in knee flexion and leg rotation.
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