12-12-2012, 08:58 AM | #41 | |
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Join Date: Oct 2004
Location: Forest Grove, Beaverton, Oregon
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Re: How good would a sword made out of a meteorite really be?
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The author was M.A. Lloyd, and... I'm not good at web-searching, but got lucky. http://dataweaver.tripod.com/play/Voodoo/ The mystery I mentioned is under the Path of Glamour: Objectify Thanks for asking and making me take a trip through the recesses of my foggy memory. :)
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12-12-2012, 10:20 AM | #42 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: How good would a sword made out of a meteorite really be?
Generally speaking you'd manufacture it in a nuclear reactor by neutron irradiation of iron. It's hard to produce because Fe-59 is unstable with a half-life of 44 days, so what you'll mostly get is a bunch of Cobalt-60 with a bit of Iron-60 mixed in. It's probably easier to produce radioisotopes of common alloying agents; Nickel-59 is unstable with a half-life of 76,000 years, Nickel-62 is unstable with a half-life of 100 years, and both are produced from a single neutron absorption for a naturally occurring isotope.
Last edited by Anthony; 12-12-2012 at 10:43 AM. |
12-17-2012, 11:12 AM | #43 | |
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Join Date: Oct 2007
Location: Europe
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Re: How good would a sword made out of a meteorite really be?
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In my Ärth setting, it's fairly common (especially for Varangians) to pass off narwhal tusks as unicorn horns. Especially shortened ones, because they look more convincing (usually gaining you more $/pound than unshortened ones). The same was almost certainly done historically, although probably not so often (even though in our timeline, real unicorms never existed). Historically, there were counterfeit brand name swords in the 10th century. Maybe 9th too (not my period, so not sure). Look up Uflberth. I'm sure there's a market for fake meteoric iron swords. |
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12-17-2012, 11:15 AM | #44 | |
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Join Date: Oct 2007
Location: Europe
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Re: How good would a sword made out of a meteorite really be?
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As far as I know, bronze is almost as tough as iron, or can be made that tough anyway. The reason we switched from bronze to iron was because bronze requires two rare metals, copper and tin, which don't occur anywhere near each other in geological terms, whereas iron only requires iron which is comparatively much more abundant. |
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12-17-2012, 11:16 AM | #45 |
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Join Date: Oct 2007
Location: Europe
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Re: How good would a sword made out of a meteorite really be?
But how many rads would it give off per time unit? As far as I know, naturally occuring uranium has an absolutely ginormously long half-life, which suggests to me that it doesn't exactly spam ionizing particles at its surroundings.
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12-17-2012, 01:32 PM | #46 | |
Join Date: Mar 2005
Location: Maitland, NSW, Australia
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Re: How good would a sword made out of a meteorite really be?
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12-17-2012, 03:12 PM | #47 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: How good would a sword made out of a meteorite really be?
That's a fairly meaningless question, because the units aren't compatible, but trying to answer this in a sensible way, U-238 has a half-life of 1.4e+17s, meaning the portion decaying every second is roughly 5e-18. Decay energy is 4.27 MeV, but it rapidly (days) undergoes beta decay (270 keV), and then again (minutes) under goes beta decay (2.27 MeV) into U-234, which is generally it on the short term, so the total is 6.81 MeV of radiation. 6.81 MeV/238amu = 2.7e12J/kg, so total is 1.4e-5W/kg. One gram of ingested uranium would thus be 1.4e-8W; for a 70 kg 'GURPS normal' that works out to 2e-8 rads/sec, or 0.63 rads/year. Natural uranium chemically separated from ore will contain U-235 and (stable daughter) U-234 (plus any contaminants which didn't get removed chemically), making it several times as radioactive.
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12-17-2012, 03:34 PM | #48 | |
Join Date: Aug 2007
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Re: How good would a sword made out of a meteorite really be?
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A recent Nova episode and quite interesting. Especially watch to the end to see an example of the "Smith-as-magician". Anyway, I believe it was swords marked +ULFBERT+H that were authentic and made of crucible steel (and unique to the region). The imitators corrected the spelling to +ULFBERTH+ but made their swords out of cheap iron. Ihe "plus" signs are equal-armed "Greek" crosses and apparetnly before and after the name would signify a Bishop or Abbott. The name also seems to be medieval Frankish. No one knows why the mispelled name of a Frankish Bishop appeared on early Viking swords made from steel from thousands of miles away. A trade route based on interior river traffic isn't particularly improbable but it is only the +ULFBERT+H swords that were ever made of crucible steel.
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