RADIATION STANDARDS, INCLUDING FALLOUT 333 Dr. Hasteriix. Thank you very much. Representative Pricz. The next and concluding witness for this afternoon will be Dr. H. Bentley Glass, of Johns Hopkins University. STATEMENT OF H. BENTLEY GLASS,’ DEPARTMENT OF BIOLOGY, JOHNS HOPKINS UNIVERSITY Dr. Guass. Mr. Chairman, members of the committee, I feel it is a privilege to appear here again before this committee, whose previous hearmgs have contributed so greatly to knowledge of the problems, including the genetic problems, of radiation. I believe I am expected to summarize whatever developments have occurred since the hearings of 1959 in our understanding of the genetic effects of radiation and fallout. In certain respects this task has been greatly simplified for me by the 1960 report of the National Academy of Sciences Committee on the Genetic Effects of Atomic Radiation, of which Iam amember. This report was itself designed to update the earlier report of that committee, dating from 1956. The 1960 report clearly indicates that the NAS Committee saw no reason to modify its basic conclusions or to alter its chief recommendations. The geneticists still hold that any amount of ionizing radiation, however small, increases the risk of harmful mutations arising in the reproductive cells. It still recommends that all exposures to lonizing radiations be avoided whenever possible, except for necessary exposures for medical or dental diagnostic or therapeutic reasons. It further holds to the recommendation that average dose received by the reproductive organs of any person duringthefirst 30 years of life “should not exceed 10 roentgens of manmade radiation, and should be kept as far below this as is practicable.” This recommendation is in essential agreement with that of the International Commission on Radiological Protection. Since the earlier hearings before this committee there has been less dosage from ionizing radiations than was formerly estimated, but nieneY Glass: Born Jan, 17, 1906, at Laichowfu, Shantung, China. Married; two ren, Degrees and honors: Baylor University, A.B., 1926; M.A., 1929; LL.D., 1958. University of Texas, Ph. D., 1932. Washington College, Se. D., 1957. National Academy of Sciences ; American Academy of Arts and Sciences. Teaching career: Timpson High School, Timpson, Tex., 1926-28; Stephens College, Columbia, Mo., 1934-38; Goucher College, Baltimore, Md., 1938-47; Johns Hopkins University, since 1947: professor of biology, since 1952. Subsidiary activities: Bditor Quarterly. Review of Biology ; advisory editor for biology, Houghton Miffin Co.: editor, Survey of Biological Progress, vols, 3 and 4; coeditor, McCollum-Pratt Symposia, nine volumes; member, Board of School Commissioners, Baltimore City, 1954-58; member, Advisory Committee on Biology and Medicine, Atomic Energy Commission, 1955-56: member, National Academy of Sciences Committee on the Genetic Wifectg of Atomic Radiation, 1955— : member, Governor’s Advisory Committee on Nuclear Energy, Maryland, 1959 ; member, Committee on Science and Technology, Democratic Advisory Council, 1959-60: member, Continuing Committee, Pugwash Movement, I958- , national lecturer, Sigma Xi Society, 1958-59. Offices: American Association for the Advancement of Science. board of directors, 1959-62; vice president and chairman of section F (zoology), 19846; editorial board, 1948-58. American Association of University Professors, president, 1958-60. American Society of Naturalists, secretary, 1950-52. Biological Abstracts, director, survey of biological abstracting, 1952-54: trustee, 1954-60; president, 1958-60. American Institute of Biological Sciences, president, 1954-56 ; chalrman, biological sciences curriculum study, 1958- . American Civil Liberties Union, Maryland branch, president. Genetics Society of Ameriea, vice president, 1960. Conference of Biological Editors, chairman, 1957-59. Phi Beta Kappa, senator, 1961-67. Publications: “Genes and the Man,” 1963; “Forerunners of Darwin,” 1959 (coeditor and contributor) ; “Seclence and Liberal Education,” 1960; over 175 scientific, professional, and general articles. c Vedyit Sauteae EGR i 6 ‘- CrseCARCCCoe