SELECTED REFERENCES ON THE USE OF RADIOISOTOPES IN BIOLOGY ARE CONTAINED IN THIS ANNOTATED BIBLIOGRAPHY FOR SECONDARY SCHOOL STUDENTS. MATERIALS INCLUDED WERE PUBLISHED AFTER 1960 AND DEAL WITH THE PROPERTIES OF RADIATION, SIMPLE RADIATION DETECTION PROCEDURES, AND TECHNIQUES FOR USING RADIOISOTOPES EXPERIMENTALLY. THE REFERENCES ARE LISTED IN ORDER OF THEIR VALUE TO A TYPICAL HIGH SCHOOL BIOLOGY PROGRAM IN TERMS OF VARIETY, FLEXIBILITY, AND APPLICABILITY. EXPERIMENTS IN EACH REFERENCE ARE CLASSIFIED AS BASIC OR BIOLOGICAL. SPECIAL TECHNIQUES OR MATERIALS REQUIRED IN THEIR COMPLETION ARE INDICATED. SOURCES OF RADIOISOTOPE EXPERIMENTS FOR HIGH SCHOOL CHEMISTRY AND PHYSICS, A LIST OF GENERAL READINGS IN NUCLEAR SCIENCE, AND A LIST OF SUPPLIERS OF RADIOISOTOPES ARE INCLUDED. THIS DOCUMENT IS AVAILABLE FREE FROM THE UNITED STATES ATOMIC ENERGY COMMISSION, P. O. BOX 62, OAK RIDGE, TENNESSEE 37830. (AG)