/sci/ - Science & Math

>>11402659
Earth surface is 3 mSv/year average. Some places where people live long term have ~ tens of mSv, with no apparent bad effects. Some places where people do not live but visit (beaches) have 100 mSv.

ISS is 150 - 300 mSv. Mars surface is roughly the same as ISS. Deep space is 300-600 mSv.

>>11016794
>>11016791
>>11016786

Let me explain. You still need several meters of soil to protect against radiation on Mars (galactic cosmic rays). This ain't changing.

However, you also need to understand the nature of this radiation. It is constant, coming from outside the solar system, not from the Sun, and from every direction in the sky. And the flux no the surface of Mars is around 200 millisieverts per year.

This means that when you spend few hours every day on the surface, your total dose will remain well under 100 mSv per year, which may be acceptable. So Martian colonists will sleep and spend most of their day underground, but can still venture into surface buildings and outside every day for significant time.

>>10952370
>To have something sufficiently thick enough to block long exposure detrimental radiation is to have something that isn't going to work as a window.

Instead of vague statements such as this, here are actual numbers. 1 ton per square meter of high density polyethylene will halve the cosmic ray dose. So this is roughly the half-value layer.

Now, you need several of these halvings to reduce LEO GCR radiation flux (around 200 mSv per year) to something safe for children and pregnant women (say 20 mSv per year). So think several tons per square meter of shielding. This applies not just to windows, but to whole habitat volume.

>>10887465