open reservoirs,
lakes, and streams (or into open containers or wells) would settle to
the bottom. Any that didn't would be removed when the water was filtered
before being pumped to consumers. A small amount of radioactive material
might dissolve in the water, but at most this would be of concern for
only a few weeks.

Milk contamination from fallout is not expected to be a serious problem
after an attack. If cows graze on contaminated pasture and swallow
fallout particles that contain some radioactive elements, their milk
might be harmful to the thyroid glands of infants and small children.
Therefore, if possible, they should be given canned or powdered milk for
a few weeks if authorities say the regular milk supply is contaminated
by radioactive elements.

In summary, the danger of people receiving harmful doses of fallout
radiation through food, water or milk is very small. People suffering
from extreme hunger or thirst should not be denied these necessities
after an attack, even if the only available supplies might contain
fallout particles or other radioactive substances.

* * * * *

CHAPTER 3

KNOW ABOUT WARNING

SUMMARY

BEFORE AN EMERGENCY

1. Learn what outdoor warning signals are used in your community, what
they sound like, what they mean, and what actions you should take when
you hear them.

2. Make sure you know the difference between the Attack Warning Signal
and the Attention or Alert Signal (if both are used in your community).

DURING AN EMERGENCY

1. When you hear the warning signals, or warning information is
broadcast, take prompt action.

2. If the Attack Warning Signal sounds, go to a fallout shelter
immediately (unless your local government has told you to do something
else). After you are in shelter, listen to a radio for more information
and instructions.

3. If there is no public or private shelter you can go to, try to
improvise some fallout protection. As a last resort, take cover in the
best available place.

4. If there should be a nuclear flash--especially if you feel the warmth
from it--take cover _instantly_, and then move to a fallout shelter
later.

KNOW ABOUT WARNING

An enemy attack on the United States probably would be preceded by a
period of international tension or crisis. This crisis period would help
alert all citizens to the _possibility_ of attack.

If an attack actually occurs, it is almost certain that inco