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<blockquote data-quote="nickrulercreator" data-source="post: 175030" data-attributes="member: 10256"><p>Woah woah woah. 3.86x10^26 watts <em>per square meter</em>? That's very wrong. That value is the energy the sun emits TOTAL, not per square meter. The value above, 1.36kW/m^2, is how much would be hitting the spacecraft, not the 386000000000000000000000 kW emitted by the sun. No. .75 inches (minimum) wouldn't protect from the entire amount emitted by the sun, but it would protect from the 1.36kW/m^2 received. </p><p></p><p>I know how to calculate energy, that's unnecessary though. What you need to factor for is radiation. The 1.36kW is all types of radiation, not just visible light. HOW MUCH of each type of radiation is what matters. The deadly types are those shorter than visible light: Ultraviolet, X-ray, and Gamma waves. Some are transferred in the form of alpha particles, others beta particles, some protons, some electrons. .75inches (minimum) is capable of shielding from these. </p><p></p><p>You have to know that radiation isn't instant. It's compounding. You have to spend a lot of time in it to get a dangerous level. The astronauts were not in the radiation for a long time. Essentially all the radiation would do is heat up the spacecraft like it heats up Earth, maybe even less. The outside of the CSM and LM is very reflective so it prevents a lot of energy from heating the spacecraft. The spacecraft is also in a slow roll so that no one side gets heated too much. It's called passive thermal control.</p></blockquote><p></p>
[QUOTE="nickrulercreator, post: 175030, member: 10256"] Woah woah woah. 3.86x10^26 watts [I]per square meter[/I]? That's very wrong. That value is the energy the sun emits TOTAL, not per square meter. The value above, 1.36kW/m^2, is how much would be hitting the spacecraft, not the 386000000000000000000000 kW emitted by the sun. No. .75 inches (minimum) wouldn't protect from the entire amount emitted by the sun, but it would protect from the 1.36kW/m^2 received. I know how to calculate energy, that's unnecessary though. What you need to factor for is radiation. The 1.36kW is all types of radiation, not just visible light. HOW MUCH of each type of radiation is what matters. The deadly types are those shorter than visible light: Ultraviolet, X-ray, and Gamma waves. Some are transferred in the form of alpha particles, others beta particles, some protons, some electrons. .75inches (minimum) is capable of shielding from these. You have to know that radiation isn't instant. It's compounding. You have to spend a lot of time in it to get a dangerous level. The astronauts were not in the radiation for a long time. Essentially all the radiation would do is heat up the spacecraft like it heats up Earth, maybe even less. The outside of the CSM and LM is very reflective so it prevents a lot of energy from heating the spacecraft. The spacecraft is also in a slow roll so that no one side gets heated too much. It's called passive thermal control. [/QUOTE]
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