The first thing to get right is that 'radiation level' is not a single number. Beyond Earth orbit, astronauts face three overlapping hazards: trapped particles in the Van Allen belts, solar particle events from the Sun, and galactic cosmic rays from outside the solar system. The belts are intense but brief—the spacecraft crosses them quickly. Solar particle events are intermittent and operationally urgent; they can raise dose rates sharply over hours. Galactic cosmic rays are the chronic background: a low-dose-rate field of very high-energy particles, mostly protons but also heavy ions, present all the time and notoriously difficult to shield against.
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The smallest extension is theTabs-saver, which is 7518 bytes and has no code.
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