Ian Pearse
Mars
Apollo (and space) enthusiast
Posts: 308
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Post by Ian Pearse on Jul 20, 2009 12:40:02 GMT -4
Patrick Moore is a well-known amateur astronomer. His specialist subject is the Moon; he published one of the first, large-scale Lunar atlases years ago, based entirely on his own observations. He has picked up information along the way over the years but is no formall-trained expert on radiation. I would take what he says with a certain amount of... indulgence, if that's the right word. Dr Van Allen himself had things to say on passage through the belts, you cold do a lot worse than look up his comments.
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Post by reecesponder on Jul 20, 2009 14:22:11 GMT -4
yes i do understand the different radation factors, as it was part of my job, as we dealt with many different processes, but please forgive, but as the moon dosent have a atomsphere, or any other kind of protection, as those the earth, wether the journey from here to the moon, may have been through a very special part of space, the exposure to any form of radation, would be have been high, and as the film stock, it is still used by all medical and nuclear processes throughtout the world, unless something has changed, or i have been asleep. they are used to detect exposure to radation.
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Ian Pearse
Mars
Apollo (and space) enthusiast
Posts: 308
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Post by Ian Pearse on Jul 20, 2009 15:04:42 GMT -4
what you need to do is research the radiation environment of space, and check how Hasselblad modified the magazines that contaned the film stock.
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Post by JayUtah on Jul 20, 2009 15:36:08 GMT -4
...all that radation flying around.All what radiation? Most of the radiation in space is charged particles, such as is found in the solar wind and the Van Allen belts. That does not require substantial thicknesses of shielding. There is an x-ray component to solar radiation, but it is does not occur at nearly the same energy as diagnostic x-rays. In fact, x-ray energy of the degree typically produced by cosmic sources can be substantially attenuated by a meter of air at sea-level pressure. If the sun remains quiescent, the radiation environment is quite manageable. Now the camera used for the moon landing was a standard SLR, the only modification was to the trigger release, and the view finder frame, there was no lead lining to protect the film...Who told you that? The magazines for lunar surface use were manufactured by a company in Hollywood that specialized in after-market magazines and accessories for the various Hasselblad bodies. The magazine was a heavily modified version of their 70mm single-sprocket longroll magazine. The NASA statement of work specified that it had to protect the film against a 600-rad exposure. Keep in mind that these engineers realized that the primary source of radiation would be from charged particles, not from electromagnetic sources. A few grams per square centimeter suffices because of the nature of that radiation. This man is a renoned Scientist. did he suddenly, relise what he had just said.Sir Patrick Moore is a well-respected astronomer, but he is not an expert in all things space. You might do well to respect the opinion instead of Dr. James Van Allen, who is appropriately qualified to discuss the radiation in space, and who has a different idea of how much protection is required to traverse the Van Allen belts. Keep in mind that Apollo really didn't travel through the belts. It's more accurate to say the Apollo spacecraft skirted around the denser portions and stayed well away from them. When you see the three-dimensional representation of the Apollo trajectories, you realize how this was possible.
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Post by trebor on Jul 20, 2009 17:54:30 GMT -4
Dr. James Van Allen, who is appropriately qualified to discuss the radiation in space, and who has a different idea of how much protection is required to traverse the Van Allen belts. As an aside, what does he have to say on the issue? And is there a good resource on the subject?
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Post by Ginnie on Jul 20, 2009 19:17:25 GMT -4
Tonight at 7:45 on TCM... The Apollo Years Reliving July 20, 1969:The day Neil Armstrong and Edwin "Buzz" Aldrin walked on the moon.
EDIT: Its on at 8:15 EST. At 8 they have the original Melies film "A Trip to the Moon" - which Buzz himself introduces! I expect he will introduce The Apollo Years too...
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Post by gillianren on Jul 20, 2009 20:06:46 GMT -4
As an aside, what does he have to say on the issue? And is there a good resource on the subject? Did, I'm afraid; the best resource I know of is the letter he wrote to Jay calling the claim bogus. (This is a paraphrase.) I do know he wasn't a big fan of manned missions, because he thought robotic missions were cheaper.
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Post by cos on Jul 20, 2009 20:12:16 GMT -4
Dr. James Van Allen, who is appropriately qualified to discuss the radiation in space, and who has a different idea of how much protection is required to traverse the Van Allen belts. As an aside, what does he have to say on the issue? And is there a good resource on the subject? "The recent Fox TV show, which I saw, is an ingenious and entertaining assemblage of nonsense. The claim that radiation exposure during the Apollo missions would have been fatal to the astronauts is only one example of such nonsense." -- Dr. James Van Allen Nasa's summary of the radiation hazards of the Apollo missions is here; lsda.jsc.nasa.gov/books/apollo/S2ch3.htmBut they are lying of course and using science and facts to fool us (none of which is required to support the notion that it isn't possible).
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vq
Earth
What time is it again?
Posts: 129
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Post by vq on Jul 20, 2009 20:34:07 GMT -4
...When you see the three-dimensional representation of the Apollo trajectories, you realize how this was possible. I've never seen a 3d model or a 2d projection of an Apollo vehicle's trajectory through the belts. Is there a good resource where I could find this?
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