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10-13-2021, 03:27 PM | #1 |
Join Date: May 2010
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GURPS effects of exposure to a nuclear fuel source
GURPS Disasters: Meltdown and Fallout goes into some detail about dramatic ways nuclear technology can do bad stuff to you. But what if there's no meltdown, no fallout, and instead you're just directly exposed to a nuclear fuel source—say because some idiot decided to dissect a nuclear bomb or radioisotope thermoelectric generator? I've tried to research this and it turns out to be a somewhat confusing subject, because AFAICT the main types of nuclear fuel are all alpha emitters. Since alpha particles don't penetrate skin very well, alpha emitters are only dangerous if ingested or inhaled. Except alpha emitters often have much more dangerous isotopes in their decay chains. So how do you figure out the rads accumulated for, say, handling a fuel rod / pellet / etc. with no better protection than a pair of iron tongs?
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10-13-2021, 03:42 PM | #2 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: GURPS effects of exposure to a nuclear fuel source
An unused nuclear fuel pellet really isn't a short term radiation hazard at all (long term cancer risk, but not radiation sickness), unless you manage to turn bomb parts supercritical. A fuel pellet that's actually been used inside of a reactor can be extremely hot because of fission byproducts but that effect will be extremely variable with time.
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10-13-2021, 05:05 PM | #3 |
Join Date: Aug 2004
Location: traveller
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Re: GURPS effects of exposure to a nuclear fuel source
Have you looked at OSHA's Radiation Emergency Preparedness and Response page? There's a lot about the more dramatic stuff, but they also cover (e.g.) "Lost, found, or orphan (i.e., no longer under proper control, abandoned) radioactive material sources." This includes links and cross-references (as in the quote).
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10-13-2021, 05:46 PM | #4 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: GURPS effects of exposure to a nuclear fuel source
For those who are curious: if you have purified U-235, something like 92% of total decay energy will be alpha decay from U-235 to Th-231, another 8% will be Th-231 to Pa-231, and unless you leave it for thousands of years, everything else is negligible (Th-231 has a half-life of 25.5 hours so it reaches equilibrium quickly, but Pa-231 has a half-life of 32,000 years). Decay rate is 4.5e-16/sec with a decay energy of 2e+9J/g for an energy output of 9e-7W/g. 1J/kg is 100 rads, so for a 70 kg person that works out to 1.3e-6 rad/sec (about 1 rad per 9 days) if you absorb it all, which pretty much means swallowing powdered uranium.
Now, for nuclear fuel that has been used in a reactor, radiation output starts at around 6.5% of the total thermal power output of the reactor (so probably more like 20% of electrical power output), which will kill people impressively fast. |
10-13-2021, 07:09 PM | #5 | |
Join Date: May 2010
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Re: GURPS effects of exposure to a nuclear fuel source
Quote:
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10-13-2021, 07:35 PM | #6 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: GURPS effects of exposure to a nuclear fuel source
The main decay path there is Pu-238 -> U-234, which is an alpha reaction, so also mostly an internal risk, though the total amount of radioactivity is much larger.
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10-14-2021, 04:09 PM | #7 |
Night Watchman
Join Date: Oct 2010
Location: Cambridge, UK
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Re: GURPS effects of exposure to a nuclear fuel source
I think what you want is someone being careless with food irradiation equipment. Gear that will sterilise bulk meat will do nasty things to living humans. The source it's easiest to be careless with is Cobalt-60, which produces lots of 1.17 and 1.48 MeV gamma rays, which have plenty of penetrating power.
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10-14-2021, 04:24 PM | #8 | ||
Join Date: May 2010
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Re: GURPS effects of exposure to a nuclear fuel source
Quote:
Quote:
(Edit: I mean nuclear waste from a reactor—old cobalt-60 is of course another variety of nuclear waste.) Last edited by Michael Thayne; 10-14-2021 at 04:30 PM. |
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10-18-2021, 03:03 PM | #9 | ||
Join Date: Apr 2005
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Re: GURPS effects of exposure to a nuclear fuel source
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If someone does inhale/ingest alpha or beta particles, or get them on their body or clothing, the race is on to get them decontaminated and on chelating drugs or otherwise remove as much radioactive material from their body as fast as possible. Hunting down potential victims in time treatment to do any good might be an adventure in itself. Another possible avenue for exposure is objects or materials which have spent so much time in such close proximity to strong radiation emitters that they have become radioactive themselves. While they're unlikely to be so strongly radioactive that they cause burns or radiation illnesses, they have a strong potential to be long term cancer risks. The list of radiation accidents referenced above gives a good selection of such incidents. A final risk from low level radiation is that it could be weaponized and scattered across a wide area. While the actual radiation risks are very low and likely to dissipate quickly, just the knowledge that the area is irradiated will get most normal people in a panic. Quote:
Effects of long term low-level radiation exposure can take the form of penalties to Aging rolls, Susceptibility to certain cancers, the Sterility feature, and possibly the equivalent of 1-2 levels of Short Lifespan. OSHA, CDC, DOE, etc. web sites have all sorts of info on these sorts of hazards. |
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meltdown and fallout, radiation |
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