PHOTO CREDITS

[Figure 1] Armed Forces Institute of Pathology Negative No. 4156 [Figure 3] Dr. T. Tahmisian, Argonne National Laboratory [Figure 4] Oak Ridge National Laboratory (photo on right) [Figure 5] Oscar W. Richards, American Optical Company [Figure 7] Brookhaven National Laboratory [Figure 9] Battelle-Northwest Laboratory [Figure 10] Oak Ridge National Laboratory [Figure 19] Argonne National Laboratory [Figure 23] Argonne National Laboratory [Figure 24] Argonne National Laboratory [Figure 28] Argonne National Laboratory [Figure 29] Brookhaven National Laboratory

This booklet is one of the “Understanding the Atom” Series. Comments are invited on this booklet and others in the series; please send them to the Division of Technical Information, U. S. Atomic Energy Commission, Washington, D. C. 20545.

Published as part of the AEC’s educational assistance program, the series includes these titles:

Accelerators Animals in Atomic Research Atomic Fuel Atomic Power Safety Atoms at the Science Fair Atoms in Agriculture Atoms, Nature, and Man Books on Atomic Energy for Adults and Children Careers in Atomic Energy Computers Controlled Nuclear Fusion Cryogenics, The Uncommon Cold Direct Conversion of Energy Fallout From Nuclear Tests Food Preservation by Irradiation Genetic Effects of Radiation Index to the UAS Series Lasers Microstructure of Matter Neutron Activation Analysis Nondestructive Testing Nuclear Clocks Nuclear Energy for Desalting Nuclear Power and Merchant Shipping Nuclear Power Plants Nuclear Propulsion for Space Nuclear Reactors Nuclear Terms, A Brief Glossary Our Atomic World Plowshare Plutonium Power from Radioisotopes Power Reactors in Small Packages Radioactive Wastes Radioisotopes and Life Processes Radioisotopes in Industry Radioisotopes in Medicine Rare Earths Research Reactors SNAP, Nuclear Space Reactors Sources of Nuclear Fuel Space Radiation Spectroscopy Synthetic Transuranium Elements The Atom and the Ocean The Chemistry of the Noble Gases The Elusive Neutrino The First Reactor The Natural Radiation Environment Whole Body Counters Your Body and Radiation

A single copy of any one booklet, or of no more than three different booklets, may be obtained free by writing to:

USAEC, P. O. BOX 62, OAK RIDGE, TENNESSEE 37830

Complete sets of the series are available to school and public librarians, and to teachers who can make them available for reference or for use by groups. Requests should be made on school or library letterheads and indicate the proposed use.

Students and teachers who need other material on specific aspects of nuclear science, or references to other reading material, may also write to the Oak Ridge address. Requests should state the topic of interest exactly, and the use intended.

In all requests, include “Zip Code” in return address.

Printed in the United Slates of America
USAEC Division of Technical Information Extension, Oak Ridge, Tennessee

Transcriber’s Notes