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background radiation is very dependent on where you live it's different depending on altitude rocks around where you live ect. but generally comes to around 0.1 - 2 micro sieverts per hour the "ionizing radiation regulations 1999" states: Anyone under 18 should not be exposed to more than 6 milli sieverts per year above background radiation ~ 1 micro ...


The fact that the gyroradius is small compared to the Galaxy size leads to a multitude of collisions between the CR and the galactic magnetic field (compare ~pc CR vs ~kpc CR gyroradii). Each collision helps diffuse the particle, disassociating it from its original direction (i.e., makes isotropic).


The galactic magnetic field is fairly irregular on distance scales that are small compared to the size of the galaxy (although there does appear to be structure to the magnetic field associated with the spiral arms). In a uniform magnetic field, a charged particle would follow a nice spiral trajectory. In an uneven and varying magnetic field, charged ...

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