I have gone over this before and I have refrained (from spouting the same ole storyline) until now BUT the same ole subject and question keeps arising, so I'll say it again (sorry if I bore anybody).
The nuclear problem is not that difficult of a problem if one knows what they are dealing with. To survive, the following is needed:
1) The farther away from ground zero, the better. Trying to shelter from blast effects can be difficult without 24-48 hrs notice.
2) A shelter has to provide the following: Food, water, toilet facility, garbage/sewage storage/disposal, AIR, and CARBON DIOXIDE removal, a light source.
3) Nice to haves: A way to heat up food (CARBON MONOXIDE removal if a flame is lighted), board games/cards/text books, passive communications (AM/FM/UHF/satellite/scanner radio and T.V, cellphones), a method to generate electrical power, etc.
4) Radioactive particles decay on a Bell Curve. Most Gamma Ray emitting particles will go up a few miles of altitude and will stay aloft until after they have decayed and become Isotopes. Any fallout particles from the blast forced horizontally outward, at ground level, pose a serious problem until it has rained several times and washed them into the creeks, streams, rivers, etc. and/or washed them deep into the soil. Again, the farther away from Ground Zero that one is, the better. The Alpha and Beta particles are easily shielded against. Neutron radioactive particles have twice the penetration of Gamma Particles but the chances of having to deal with Neutron particles is very slight and of limited blast range and decay within 36 hours. If Neutron particles are in your neighborhood, chances are you will die quickly and quietly because distance from a potential Nuke Target is critical for survival, at any rate.
5) Gamma Particles have a range of 100-300 feet from the particle. It takes 14 Half-Life Shield thicknesses to protect one from Gamma radiation.
6) Neutron Particles have a classified range from the particle but the effective range of the weapon is destruction out 1-3 miles and radiation out to 30-35 miles. It takes 28 Half-Life Shield thicknesses to protect one from Neutron radiation. (derived from a Nursing Manual; can you believe it?)
7) Beta Particles have a range of 10-30 feet from the particle. It takes tightly woven clothing to block Beta radiation.
8) Alpha Particles have a range of 1-3 inches from the particle. It takes paper to block Alpha radiation.
9) Air intake can be achieved with a simple hand-operated cyclinder pump made from plywood with rubber trimming and axle grease and by using rubber flapper valves to control the intake and outtakes.
10) CO2 (& Carbon Monoxide) removal can be achieved with a 2" PVC pipe that runs from a 1/4" off of the deck to the exterior. A rubber flapper valve attached to the top rim of the pipe, outside of the shelter, will allow the gases to escape when air is forced into the shelter and close off as air is sucked into the shelter, by the hand-operated pump.
11) A porta-potty will collect sewage and short trips can be made to the toilet to dump the holding tank when it is full, providing that one is sheltering inside of their home.
12) Potable water can be stored inside of the area chosen to be a shelter in various ways. Non-potable water (for the toilet reservoir) can be stored in any container in or outside of the shelter.
13) Possible shelter spaces within the home (providing you are far enough away from Ground Zero to start with) can be a bathroom (the larger the better) or a garage (have to seal off around the doors and windows) and be able to run piping for air intake, CO2 out take, and conduit for power (?) and external antennas (if you have communications capabilities).
14) Great sources of info:
www.standeyo.com www.daretoprepare.com and place the following into a search engine: What to Do If Nuclear Attack Or Disaster Is Imminent; and Nuclear War Survival Skills.
15) The knowledge of the threat and actively planning & preparing for that event will have one prepared for just about any natural or man made disaster and allows one to sleep very well at night.
16) IMHO!