You also can use any of these substances to block basement windows and
thus prevent outside fallout radiation from entering your basement in
that manner.

* A PERMANENT OUTSIDE SHELTER. If your home has no basement, or if you
prefer to have a permanent-type home shelter in your yard, you can
obtain instructions on how to construct several different kinds of
outside fallout shelters by writing to the U.S. Office of Civil Defense,
Department of Defense, Washington, D.C. 20310. There is no charge for
these.


WHEN TO LEAVE SHELTER

You should not come out of shelter until you are told by authorities
that it is safe to do so. Special instruments are needed to detect
fallout radiation and to measure its intensity. Unless you have these
instruments, you will have to depend on your local government to tell
you when to leave shelter.

This information probably would be given on the radio, which is one
reason why you should keep on hand a battery-powered radio that works in
your shelter area.

If you came out of shelter too soon, while the fallout particles outside
were still highly radioactive, you might receive enough radiation to
make you sick or even kill you.

Remember that _fallout particles_ can be seen, but the _rays_ they give