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The Genetic Effects of Radiation

Chapter 27: Footnotes
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About This Book

The text explains how genetic information is organized and transmitted through cells, chromosomes, genes, and biochemical processes. It surveys mutations, distinguishing sudden and spontaneous changes while addressing mutation rates and the concept of genetic load. Various forms and sources of radiation are described, with emphasis on how ionizing radiation and energetic particles produce ionization, free radicals, and chromosomal damage. The relationship between dose, exposure rate, and biological consequence is examined, including radiation sickness and effects observed in mammals, and the work concludes with a brief synthesis and suggested references for further study.

Radiation Dose Rate and Mutation Frequency, W. L. Russell and others, Science, 128: 1546 (December 19, 1958).

Ionizing Radiation and the Living Cell, Alexander Hollaender and George E. Stapleton, Scientific American, 201: 95 (September 1959).

Radiation and Human Mutation, H. J. Muller, Scientific American, 193: 58 (November 1955).

Ionizing Radiation and Evolution, James F. Crow, Scientific American, 201: 138 (September 1959).

Motion Pictures

Radiation and the Population, 29 minutes, sound, black and white, 1962. Produced by the Argonne National Laboratory. This film explains how radiation causes mutations and how these mutations are passed on to succeeding generations. Mutation research is illustrated with results of experimentation on generations of mice. A discussion of work with fruit flies and induced mutations is also included. This film is available for loan without charge from the AEC Headquarters Film Library, Division of Public Information, U. S. Atomic Energy Commission, Washington, D. C. 20545 and from other AEC film libraries.

The following films were produced by the American Institute of Biological Sciences and may be rented from the Text-Film Division, McGraw-Hill Book Company, 330 West 42nd Street, New York 10036.

Mutation, 28 minutes, sound, color, 1962. This film discusses chromosomal and genetic mutations as applied to man. Muller’s work in inducing mutations by X rays is described.

These three films are 30 minutes long, have sound, are in black and white, and were released in 1960. They are part of a 48-film series that is correlated with the textbook, Principles of Genetics, (fifth edition), Edmund W. Sinnott, L. C. Dunn, and Theodosius Dobzhansky, McGraw-Hill Book Company, 1958, 459 pp., $8.50.

Mutagen-Induced Gene Mutation. The narrator of this film is Hermann J. Muller, who won a Nobel Prize in 1946 for his work in the field of genetics. The measurement of X-ray dose in roentgens and the dose required to double the spontaneous mutation rate in Drosophila and mice are discussed. The magnitude and meaning of permissible doses of high-energy radiation are discussed. Other mutagenic agents (ultraviolet light and chemical substances) are discussed, concluding with comments on the importance of gene mutation in the present and future.

Selection, Genetic Death and Genetic Radiation Damage. The narrator of this film is Theodosius Dobzhansky, the coauthor of this booklet. Genetic death is discussed in detail, as are examples of how genetic loads are changed subsequent to radiation exposure. While it is generally agreed that the great majority of mutants are harmful when homozygous, more evidence is needed about the beneficial and detrimental effects of mutants when heterozygous. In the case of sickle cell anemia, heterozygotes are adaptively superior to normal homozygotes. This makes for balanced polymorphism, by which a gene is retained in the population despite its lethality when homozygous because of the advantage it confers when heterozygous.

Gene Structure and Gene Action. The lecturer of this film is G. W. Beadle of Cornell University. The Watson-Crick structure of DNA is discussed in terms of mutation. Several tests of the chain separation hypothesis for DNA replication are described (experiments with heavy DNA, radioactive chromosomes, and the replication of DNA in vitro). This working hypothesis is presented: The coded information in DNA is transferred to RNA, which serves as a template for polypeptide synthesis.

PHOTO CREDITS
Dr. Asimov’s photograph by David R. Phillips, courtesy Chemical and Engineering News
Page
4 James German, M.D.
6 Bausch & Lomb, Inc.
12 James German, M.D.
20 Indiana University
24 Robert C. Filz, Air Force Cambridge Research Laboratories
25 J. K. Boggild, Niels Bohr Institute, Copenhagen University
26 Brookhaven National University
28, 31 Herman Yagoda, Air Force Cambridge Research Laboratories
41 Oak Ridge National Laboratory

Footnotes

[1]For more detail about cell division, see Radioisotopes and Life Processes, another booklet in this series.
[2]This is more commonly known as “Mongolism” or “Mongolian idiocy” though it has nothing to do with the Mongolian people.
[3]Actually, all waves have some of the characteristics of particles and all particles have some of the characteristics of waves. Usually, however, the radiation is predominantly one or the other and little confusion arises under ordinary circumstances in speaking of waves and particles as though they were separate phenomena.
[4]For more about this subject, see Radioisotopes in Industry and Radioisotopes in Medicine, companion booklets in this series.
[5]For more about this subject, see Fallout from Nuclear Tests, another booklet in this series.
[6]For details on somatic effects of radiation, see Your Body and Radiation, a companion booklet in this series.
[7]Estimated average exposures to the gonads, based on 1963 report of Federal Radiation Council.
[8]One thousandth of a rem.
[9]Nevertheless, it should be pointed out that the precautions taken in the atomic energy industry are such that absorption of radiation is not as severe a problem as one might suspect. Fully 95% of those engaged in this work receive less than 1 rem a year. Only 1% receive more than 5 rems.

UNITED STATES ATOMIC ENERGY COMMISSION

Dr. Glenn T. Seaborg, Chairman
James T. Ramey
Dr. Gerald F. Tape
Dr. Samuel M. Nabrit
Wilfrid E. Johnson

ONE OF A SERIES ON
UNDERSTANDING THE ATOM

Nuclear energy is playing a vital role in the life of every man, woman, and child in the United States today. In the years ahead it will affect increasingly all the peoples of the earth. It is essential that all Americans gain an understanding of this vital force if they are to discharge thoughtfully their responsibilities as citizens and if they are to realize fully the myriad benefits that nuclear energy offers them.

The United States Atomic Energy Commission provides this booklet to help you achieve such understanding.

Edward J. Brunenkant

Director

Division of Technical Information

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:

NUCLEAR POWER AND MERCHANT SHIPPING
PLUTONIUM
OUR ATOMIC WORLD
NUCLEAR ENERGY FOR DESALTING
CONTROLLED NUCLEAR FUSION
WHOLE BODY COUNTERS
PLOWSHARE
POPULAR BOOKS ON NUCLEAR SCIENCE
SNAP, NUCLEAR SPACE REACTORS
NUCLEAR REACTORS
ATOMS, NATURE, AND MAN
MICROSTRUCTURE OF MATTER
SYNTHETIC TRANSURANIUM ELEMENTS
COMPUTERS
RESEARCH REACTORS
GENETIC EFFECTS OF RADIATION
POWER FROM RADIOISOTOPES
NONDESTRUCTIVE TESTING
RARE EARTHS
FOOD PRESERVATION BY IRRADIATION
FALLOUT FROM NUCLEAR TESTS
RADIOACTIVE WASTES
RADIOISOTOPES IN INDUSTRY
ATOMS AT THE SCIENCE FAIR
RADIOISOTOPES AND LIFE PROCESSES
ATOMIC FUEL
ATOMIC POWER SAFETY
DIRECT CONVERSION OF ENERGY
CAREERS IN ATOMIC ENERGY
RADIOISOTOPES IN MEDICINE
ACCELERATORS
NUCLEAR TERMS, A BRIEF GLOSSARY
NEUTRON ACTIVATION ANALYSIS
ATOMS IN AGRICULTURE
POWER REACTORS IN SMALL PACKAGES

Single copies of any booklet may be obtained free by writing to:

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

Requests for more than three titles generally can not be honored.

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 publications on specific topics related to 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.

IMPORTANT: All requests should include the “Zip Code” in the address to which the material is to be mailed.

Printed in the United States of America


USAEC Division of Technical Information Extension, Oak Ridge, Tennessee
September 1966

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