“ es, such as height of burst com -gtudies as well as revising theoretical studi putations. nuclear radiations were In addition to blast, thermal, visible and also measurcd. are nnaly— It is expected that these oxperiments, once the data to GREENHOUSE. ged, will fill many of the gaps existing in theory prior c. REMOTE WEAPON PERFORMANCE MEASUREMENTS the future as well as In an effort to simplify weapon proof testing in e in combat, simplified to provide possible means of measuring weapon performanc instruments suitable for usc in aircraft wore tested, designed to measure transit time, alpha and yield, These instruments were Preliminary work was done at LAS VEGAS, NEVADA in January 1951 during Operation RANGER. _ struments to measure transit time are now available. Successful in- Some difficulty in measur- ing yield with the BHANGMETER was encountered; however, improvements made in canbu this device during the tests make it appear thata satisfactory instrument mado available with further mechanical and clectronic engineering. Further stud and experimentation is required in the development of the remote alpha measuring equipment. e. 8. Fora more detailed discussion of Program 1.0, noe Appendix "A", PROGRAM 2,0 — BIOMEDICAI. The objective of thebiomedical, progran was to obtain information which can Swine, be used in planning effective medical care for the victims of atomic wirfare. dogs and mice were exposed in order to determine the blast, thermal and nuclear radiation effects as related to time and distance from ground zero. The biological effects observed were approximately the same as those predicted by laboratory tests. For animals exposed in the vicinity of ground zcro the lethal range due to the blast effects did not extend as far as the icthal range due to the nuclear radiation ef- fects, The thermal burns caused by the atomic cxplosions were due primrily to the visible light region of the spectrum and occurred during the first one-half second after the detonation. The nuclear radiation produced by the atomic cxplosions ap- peared to be 30% to 40% more effective biologically than the high voltage radiations produced in the laboratory. Measurements of radiation dosage by analysis of effects on plants, sceds and animals compared fairly closcly with measurements obtained by radiation instruments and calibrated film. In the case of the larger animals, does appeared to be more satisfactory than swine in the determination of lethal radiation ss ~~ ly . P SERET ory a rr TA sane mons ELLY eT f