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    When describing the gamma camera do you think it will be good enough to describe the components (collimator, scintillator, photomultiplier tubes) simply or would be have to be very detailed.

    I would like to say something like:

    "The collimator consists of a honey comb shaped piece of lead which absorbs all incoming gamma rays apart from ones coming from directly below the patient."

    "The scintillator is a piece of phosphor which converts the incoming gamma rays into photons and then using a photocathode turns these photons into photoelectrons."

    "The photomultiplier tubes increase the amount of photo electrons present and accelerates them until it is enough to generate an detectable electrical pulse."

    But I'm scared that I would needs to talk about how the photomultiplier does what it does (with the bouncing of photoelectrons between dynodes causing more electrons to be freed while accelerating them) which is honestly quite a lot to remember baring in mind it's since a tiny part of the chapter.

    Please keep this relevent to OCR Physics A please since this is most likely a mark scheme thing.

    Thank you all
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