This version (2021/09/14 10:26 ) is a draft.Anonimous)
Approvals: 0/1
The Previously approved version (2021/05/16 21:51) is available.Diff
Freefall 3358

Life problems in low gravity

How much shielding do we have?
Well, shielding is a little complicated. Higher energy gamma rays have more penetrating power. The thumb rule is 5 cm of lead, 10 cm of steel, or 120 cm of water is one ten-thickness.
A ten-thickness is the amount of material needed to reduce the radiation level to one tenth of the unshielded value.
100 gray, 6 MeV source
5 cm of lead
Radiation level: 10 gray
5 cm of lead
Radiation level: 1 gray
Wow. That much material wrapped around a spaceship would be heavy… and expensive to accelerate… and we don't have much shielding, do we?

Color by George Peterson

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