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Post by randombloke on Dec 17, 2010 11:28:57 GMT -4
Not strictly (or not entirely) to do with Apollo, but can anyone point me to some sources for data on radiation in a) Earth orbit b) Lunar orbit c) Interplanetary space in the solar system
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Post by drewid on Dec 17, 2010 12:50:33 GMT -4
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Post by Obviousman on Dec 17, 2010 16:04:39 GMT -4
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Post by Obviousman on Dec 17, 2010 16:09:21 GMT -4
There are some other papers available from the NASA Technical Reports Server:
Bragg Curve, Biological Bragg Curve and Biological Issues in Space Radiation Protection with Shielding
Author(s): Honglu, Wu; Cucinotta, F.A.; Durante, M.; Lin, Z.; Rusek, A. Abstract: The space environment consists of a varying field of radiation particles including high-energy ions, with spacecraft shielding material providing the major protection to astronauts from harmful exposure. NASA Center: Johnson Space Center Publication Year: 2006 Added to NTRS: 2009-11-25 Document ID: 20080029277; Report Number: JSC-CN-9980
Analytic Shielding Optimization to Reduce Crew Exposure to Ionizing Radiation Inside Space Vehicles
Author(s): Gaza, Razvan; Cooper, Tim P.; Hanzo, Arthur; Hussein, Hesham; Jarvis, Kandy S.; Kimble, Ryan; Lee, Kerry T.; Patel, Chirag; Reddell, Brandon D.; Stoffle, Nicholas; Zapp, E. Neal; Shelfer, Tad D. Abstract: A sustainable lunar architecture provides capabilities for leveraging out-of-service components for alternate uses. Discarded architecture elements may be used to provide ionizing radiation shielding to the ... NASA Center: Johnson Space Center Publication Year: 2009 Added to NTRS: 2009-10-14 Document ID: 20090035371; Report Number: JSC-CN-18881
Statistical Prediction of Solar Particle Event Frequency Based on the Measurements of Recent Solar Cycles for Acute Radiation Risk Analysis
Author(s): Myung-Hee, Y. Kim; Shaowen, Hu; Cucinotta, Francis A. Abstract: Large solar particle events (SPEs) present significant acute radiation risks to the crew members during extra-vehicular activities (EVAs) or in lightly shielded space vehicles for space missions beyond the protection ... NASA Center: Johnson Space Center Publication Year: 2009 Added to NTRS: 2009-09-30 Document ID: 20090033667; Report Number: JSC-CN-18746
Can the Equivalent Sphere Model Approximate Organ Doses in Space
Author(s): Lin, Zi-Wei Abstract: For space radiation protection it is often useful to calculate dose or dose,equivalent in blood forming organs (BFO). It has been customary to use a 5cm equivalent sphere to. simulate the BFO dose. However, many ... NASA Center: Marshall Space Flight Center Publication Year: 2007 Added to NTRS: 2009-08-24 Document ID: 20090028812; Report Number: MSFC-309, MSFC-319
Effects of Nuclear Cross Sections at Different Energies on Space Radiation Exposure from Galactic Cosmic Rays
Author(s): Li, Zi-Wei; Adams, James H., Jr. Abstract: Space radiation from galactic cosmic rays (GCR) is a major hazard to space crews, especially in long duration human space explorations. For this reason, they will be protected by radiation shielding that ... NASA Center: Marshall Space Flight Center Publication Year: 2007 Added to NTRS: 2009-08-20 Document ID: 20090028663; Report Number: MSFC-378
Radiation Protection Effectiveness of Polymeric Based Shielding Materials at Low Earth Orbit
Author(s): Badavi, Francis F.; Stewart-Sloan, Charlotte R.; Wilson, John W.; Adams, Daniel O. Abstract: Correlations of limited ionizing radiation measurements onboard the Space Transportation System (STS; shuttle) and the International Space Station (ISS) with numerical simulations of charged particle transport through ... NASA Center: Langley Research Center Publication Year: 2008 Added to NTRS: 2009-08-11 Document ID: 20090026971; Report Number: LF99-5666
Validity of the Aluminum Equivalent Approximation in Space Radiation Shielding
Author(s): Badavi, Francis F.; Adams, Daniel O.; Wilson, John W. Abstract: The origin of the aluminum equivalent shield approximation in space radiation analysis can be traced back to its roots in the early years of the NASA space programs (Mercury, Gemini and Apollo) wherein the primary ... NASA Center: Langley Research Center Publication Year: 2009 Added to NTRS: 2009-08-06 Document ID: 20090026532; Report Number: L-19705, LF99-9078, NASA/TP-2009-215779
Radiation Protection for Lunar Mission Scenarios
Author(s): Clowdsley, Martha S.; Nealy, John E.; Wilson, John W.; Anderson, Brooke M.; Anderson, Mark S.; Krizan, Shawn A. Abstract: Preliminary analyses of shielding requirements to protect astronauts from the harmful effects of radiation on both short-term and long-term lunar missions have been performed. Shielding needs for both ... NASA Center: Langley Research Center Publication Year: 2005 Added to NTRS: 2009-07-29 Document ID: 20050215115
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Post by randombloke on Dec 17, 2010 16:56:53 GMT -4
Ah, OK, apparently people only measure radiation in space when they are then immediately going to talk about shielding it. I guess that explains why I was having trouble finding useful info under "space radiation."
Thanks a lot guys.
P.S. I don't suppose anyone's been mapping the radiation environment of the solar system with probes and made a nice 3-D map with colour gradients and everything? Yeah, didn't think so.
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Post by grashtel on Dec 18, 2010 22:58:36 GMT -4
P.S. I don't suppose anyone's been mapping the radiation environment of the solar system with probes and made a nice 3-D map with colour gradients and everything? Yeah, didn't think so. The problem is that the radiation conditions aren't constant (mostly due to the variations in solar activity) so the map would be hopelessly inaccurate before it was even fished. That said there are some pretty much constant features (eg Earth's Van Allen Belts and Jupiter's radiation belts) but they are influenced by the surrounding environment so anything but a very general map of them wouldn't be much use either.
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Post by randombloke on Dec 19, 2010 10:11:47 GMT -4
Yeah, I figured it was just vain wishful thinking. to make it work for reals you'd probably need a set of probes permanently 'on-station' at various points in the solar system, constantly broadcasting data on their local environment which would be picked up by ships and planets and integrated into their own local maps...
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Jason
Pluto
May all your hits be crits
Posts: 5,579
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Post by Jason on Dec 21, 2010 12:44:03 GMT -4
"Planets"? As in, Earth and other planets as well?
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Post by randombloke on Dec 21, 2010 16:45:49 GMT -4
Well yes, if you're going to have gajillions of probes whirring about you're going to need someone for them to talk to...
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Post by ka9q on Dec 28, 2010 11:15:40 GMT -4
Yeah, I figured it was just vain wishful thinking. to make it work for reals you'd probably need a set of probes permanently 'on-station' at various points in the solar system, constantly broadcasting data on their local environment which would be picked up by ships and planets and integrated into their own local maps... Well, yes. And in fact such probes do exist. Try the Advanced Composition Explorer (ACE). It's in a "halo" orbit at the earth-sun L1 point, which means it sits about 1.5 million km toward the sun and slowly circling it as seen from the earth. At that location (which also hosts the more famous SOHO, the source of all those cool coronagraphs of comets hitting the sun) ACE can sense clouds of charged particles on their way to earth, giving perhaps half an hour's warning of a geomagnetic storm. You can get the data in real time off the web here: www.swpc.noaa.gov/ace/Yours truly wrote the ground software NOAA uses to demodulate the "real time solar wind" data from this spacecraft.
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Bob B.
Bob the Excel Guru?
Posts: 3,072
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Post by Bob B. on Dec 28, 2010 12:20:58 GMT -4
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Post by ka9q on Dec 28, 2010 21:22:57 GMT -4
Bob, do you know where I can get a copy of the radiation model code that I can run myself? I want to give it a latitude, longitude and time (so it can compute geomagnetic position), select a range of electron or proton energies, and get back a flux rate (particles/cm^2/sec).
I'd like to plug that into an orbit model so I can compute integrated dose that a spacecraft with a given amount of shielding will receive in an arbitrary orbit.
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Bob B.
Bob the Excel Guru?
Posts: 3,072
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Post by Bob B. on Dec 29, 2010 11:05:45 GMT -4
Bob, do you know where I can get a copy of the radiation model code that I can run myself? I'm afraid not. I want to give it a latitude, longitude and time (so it can compute geomagnetic position), select a range of electron or proton energies, and get back a flux rate (particles/cm^2/sec). I'd like to plug that into an orbit model so I can compute integrated dose that a spacecraft with a given amount of shielding will receive in an arbitrary orbit. That would be great. I've thought about doing something like that myself, but at this point in time I'm not motivated enough to take it on.
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Post by drewid on Dec 29, 2010 15:17:29 GMT -4
Bob, do you know where I can get a copy of the radiation model code that I can run myself? I want to give it a latitude, longitude and time (so it can compute geomagnetic position), select a range of electron or proton energies, and get back a flux rate (particles/cm^2/sec). I'd like to plug that into an orbit model so I can compute integrated dose that a spacecraft with a given amount of shielding will receive in an arbitrary orbit. You might be able to do something like that using the Spenvis site? www.spenvis.oma.be/
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Post by ka9q on Dec 30, 2010 7:19:14 GMT -4
Thanks. Looks like they can accept orbital elements and compute a trajectory from that, so it looks like even less work than I thought it would be.
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