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  • December 16, 2014 at 4:42 pm #960
    vinz
    Member

    Hello Richard,
    becase they a used in other context too, it is not possible for me to, find what you mean with shortcuts CME or GRB. Could you please post some wikipedia-links on this.

    I suppose its some short rise of the radiation-values because of sun or space – on half the earth all the same time.

    Vinz

    • This topic was modified 9 years, 3 months ago by uRADMonitor.
    • This topic was modified 9 years, 3 months ago by uRADMonitor.
    December 16, 2014 at 10:31 pm #962
    richardp61
    Participant

    http://en.m.wikipedia.org/wiki/Gamma_ray_burst

    December 16, 2014 at 10:31 pm #963
    richardp61
    Participant

    http://en.m.wikipedia.org/wiki/Coronal_mass_ejection#/search

    December 17, 2014 at 9:13 pm #974
    vinz
    Member

    Hi Richard,

    That’s fantastic. 🙂 Did you already engage in this?

    How long (time) is the “impact” on earth? I read about 0.3 to 30secs for the GRB.
    And how strong is the radiation increase in % over normal?
    I’d like to estimate the response for a single URAD device in the 1-minute samples.
    Example: Impact is 0.5 counts (CPM) more than it would be.

    Currently I’d assume it’s too short and too weak to find it with dosimeters on earth. 🙂 (But don’t know!)

    Next would be finding correlations over several devices.
    Vinz

    December 30, 2014 at 3:48 pm #1043
    richardp61
    Participant

    Hi Vinz and all
    Most of the measurable radiation at the earth’s surface from  a GRB will be in the form of showers of secondary particles, principally muons. As muon forming reactions in the upper atmosphere are much less likely for gamma photons below about 10GeV, it is going to be the briefer high energy GRBs that will be detectable on earth.

    A paper I was reading (Atri, Melot and Karam 2013) just now looking at 2 Milky Way GRBs calculated that they respectively delivered doses of 0.11 and 300uSv, over a period of 0.1sec. I would have thought this puts this class of phenomena within the detectabilty range of our SBM20 based GM detectors. At the top end of that dose range we are probably looking at a muon flux that would saturate the detector so I’m not sure how this would be represented in the read out from any one device.

    December 30, 2014 at 3:50 pm #1044
    richardp61
    Participant

    I realise this discussion is deviating away from security issues so maybe a moderator could move it to a more suitable place in the forum

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