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not original to above site-this article was gleaned from the web
                                                                 
Army Survival Field Manual, after a Nuclear incident:  


Food Procurement   

Although it is a serious problem to obtain edible food in a
radiation- contaminated area, it is not impossible to solve. You
need to follow a few special procedures in selecting and
preparing rations and local foods for use. Since secure
packaging protects your combat rations, they will be perfectly
safe for use. Supplement your rations with any food you can find
on trips outside your shelter. Most processed foods you may find
in abandoned buildings are safe for use after decontaminating
them. These include canned and packaged foods after removing the
containers or wrappers or washing them free of fallout
particles. These processed foods also include food stored in any
closed container and food stored in protected areas (such as
cellars), if you wash them before eating. Wash all food
containers or wrappers before handling them to prevent further
contamination.   If little or no processed food is available in
your area, you may have to supplement your diet with local food
sources. Local food sources are animals and plants.   


Animals as a Food Source    

Assume that all animals, regardless of their habitat or living
conditions, were exposed to radiation. The effects of radiation
on animals are similar to those on humans. Thus, most of the
wild animals living in a fallout area are likely to become sick
or die from radiation during the first month after the nuclear
explosion. Even though animals may not be free from harmful
radioactive materials, you can and must use them in survival
conditions as a food source if other foods are not available.
With careful preparation and by following several important
principles, animals can be safe food sources.   First, do not
eat an animal that appears to be sick. It may have developed a
bacterial infection as a result of radiation poisoning.
Contaminated meat, even if thoroughly cooked, could cause severe
illness or death if eaten.   Carefully skin all animals to
prevent any radioactive particles on the skin or fur from
entering the body. Do not eat meat close to the bones and joints
as an animal's skeleton contains over 90 percent of the
radio-activity.  The remaining animal muscle tissue, however,
will be safe to eat. Before cooking it, cut the meat away from
the bone, leaving at least a 3-millimeter thickness of meat on
the bone. (About 1\4 inch.)   Discard all internal organs
(heart, liver, and kidneys) since they tend to concentrate beta
and gamma radioactivity.   Cook all meat until it is very well
done. To be sure the meat is well done, cut it into less than
13-millimeter-thick pieces before cooking.  Such cuts will also
reduce cooking time and save fuel.  The extent of contamination
in fish and aquatic animals will be much greater than that of
land animals. This is also true for water plants, especially in
coastal areas. Use aquatic food sources only in conditions of
extreme emergency.   All eggs, even if laid during the period of
fallout, will be safe to eat.  Completely avoid milk from any
animals in a fallout area because animals absorb large amounts
of radioactivity from the plants they eat.       


Plants as a Food Source     

Plant contamination occurs by the accumulation of fallout on
their outer surfaces or by absorption of radioactive elements
through their roots. Your first choice of plant food should be
vegetables such as potatoes, turnips, carrots, and other plants
whose edible portion grows underground.   These are the safest
to eat once you scrub them and remove their skins.  Second in
order of preference are those plants with edible parts that you
can decontaminate by washing and peeling their outer surfaces.
Examples are bananas, apples, tomatoes, prickly pears, and other
such fruits and vegetables.   Any smooth-skinned vegetable,
fruit, or plant that you cannot easily peel or effectively
decontaminate by washing will be your third choice of emergency
food.  The effectiveness of decontamination by scrubbing is
inversely proportional to the roughness of the fruit's surface.
Smooth-surfaced fruits have lost 90 percent of their
contamination after washing, while washing rough-surfaced plants
removes only about 50 percent of the contamination.   You eat
rough-surfaced plants (such as lettuce) only as a last resort
because you cannot effectively decontaminate them by peeling or
washing.   Other difficult foods to decontaminate by washing
with water include dried fruits (figs, prunes, peaches,
apricots, pears) and soya beans. In general, you can use any
plant food that is ready for harvest if you can effectively
decontaminate it. Growing plants, however, can absorb some
radioactive materials through their leaves as well as from the
soil, especially if rains have occurred during or after the
fallout period.  Avoid using these plants for food except in an
emergency.