Radiation Levels - According to a University of Oxford nuclear and medical physicist, a reasonably safe level of radiation limit per month is more like 100 mSv per month, with a lifelong limit of 5,000 mSv, than the quite low limit 1 mSv per year. Cancer patients' healthy tissue near the site of the cancer receive a far higher dose than this and their healthy tissue recovers, given time.
Radiation is given to cancer tumours in small doses so that the surrounding cells have a chance to recover. 'The basis of this effect is that tumor cells are generally defective in DNA repair and cannot repair damage from radiation to their DNA as efficiently as normal cells.' [Orac's Blog]
Acceleration of Particles by a Supernova - Stripes have been detected in the Tycho's Supernova remnant. These stripes may provide the first direct evidence that supernova remnants can accelerate particles to energies a hundred times higher than those achieved by the most powerful particle accelerator on Earth, the Large Hadron Collider.
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