In the Medical Diagnostic Technique Known as Positron Emission Tomography $\gamma$

question 37

Multiple Choice

In the medical diagnostic technique known as positron emission tomography (PET) , a positron and an electron annihilate each other and two $\gamma$ -ray photons are emitted. What is the angle between the momentum vectors of the two photons?

• A)zero degrees
• B)45°
• C)90°
• D)180°
• E)Any angle is possible.

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