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A2 Radioactivity Geiger Counters Watch

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    Hi,

    There are a few things/questions that I don't understand about radioactivity.

    1. On the graph, I don't understand why the curve evens out due to beta particles being absorbed and producing gamma photons (I'm not sure why this happens).

    2. I'm also not sure about the significance of dead time and how a quenching agent reduces dead time (and why dead time needs to be reduced) I've read quite a bit about this but different sources have said it in different ways and I'm a bit confused.

    Any help would be really appreciated
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    (Original post by VioletPhillippo)
    Hi,

    There are a few things/questions that I don't understand about radioactivity.

    1. On the graph, I don't understand why the curve evens out due to beta particles being absorbed and producing gamma photons (I'm not sure why this happens).

    2. I'm also not sure about the significance of dead time and how a quenching agent reduces dead time (and why dead time needs to be reduced) I've read quite a bit about this but different sources have said it in different ways and I'm a bit confused.

    Any help would be really appreciated
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    Could you take a pic of the entire page plz? Maybe even the page before that? I didn't do this at A2 but I'm sure I can explain it given some context
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    (Original post by Darth_Narwhale)
    Could you take a pic of the entire page plz? Maybe even the page before that? I didn't do this at A2 but I'm sure I can explain it given some context
    Hiya,

    Thanks so much for you reply. This is the page that the graph is on.
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    (Original post by VioletPhillippo)
    Hi,

    There are a few things/questions that I don't understand about radioactivity.

    1. On the graph, I don't understand why the curve evens out due to beta particles being absorbed and producing gamma photons (I'm not sure why this happens).
    When there is no absorber, the count rate or the radioactivity is in term of a mixture of beta particles and gamma rays.
    When an absorber of 5mm thick is placed in front of the counter, the beta particles are fully absorbed by the absorber's material and left only gamma rays passing through the material.
    The horizontal portion is indicating number of gamma rays detected per second.
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    (Original post by Eimmanuel)
    When there is no absorber, the count rate or the radioactivity is in term of a mixture of beta particles and gamma rays.
    When an absorber of 5mm thick is placed in front of the counter, the beta particles are fully absorbed by the absorber's material and left only gamma rays passing through the material.
    The horizontal portion is indicating number of gamma rays detected per second.
    Thank you, I understand that much better now. What is the line labelled range referring to?
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    (Original post by VioletPhillippo)
    Thank you, I understand that much better now. What is the line labelled range referring to?
    I suspect it means the thickness of the absorber that completely absorbs the beta radiation.
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    (Original post by Eimmanuel)
    I suspect it means the thickness of the absorber that completely absorbs the beta radiation.
    Looks more like that at the point the gradient starts to become more gradual, so the count rate decreases much more slowly and not linearly.


    P.S, VioletPhillippo, could you tell me what book is that?
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    (Original post by SaadKaleem)
    Looks more like that at the point the gradient starts to become more gradual, so the count rate decreases much more slowly and not linearly.


    P.S, VioletPhillippo, could you tell me what book is that?
    Hiya,

    It's from my textbook, which is the AQA A-level one.
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    (Original post by VioletPhillippo)
    Thank you, I understand that much better now. What is the line labelled range referring to?
    (Original post by SaadKaleem)
    Looks more like that at the point the gradient starts to become more gradual, so the count rate decreases much more slowly and not linearly.


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