Radiation Shelter

Due to solar events, which bring a flare of heavy radiation to the surface of Mars it is necessary to build a radiation shelter as early in the game as possible to protect the human astronaut in the manned mission.

The current radiation of the astronaut's body can be measured with the medical tool by equipping it to the hand and pressing 'Q'. The radiation is measured in the SI-Unit Sievert (Sv), which is an expression to 'damage done to the human body'. In real life a dose of about 1 Sv is considered to be deadly, in game a dose of nearly 1.5 Sv equals to 'still alive'. Additionally, body radiation decreases over time in game (!), by about 25 µSv per second.

Basic Shelter
A basic radiation shelter is built out of 4 corners and 4 edges, plus a supporting outdoor base frame. This build is small, but does the job. Its orientation should be chosen in a way, that provides shadow against the sun, because the sun is the origin of that heavy radiation.

Background
On earth we don't need an extra radiation shelter against sun's radiation, because earth has a protective magnetic field and a thicker atmosphere, mars lacks both of this. On earth, particles of the 'solar wind' are guided along the magnetic field lines to the north pole and the south pole where they enter earth's atmosphere in shiny shades of light, which is known as 'Aurora Borealis', or the Polar Lights.