“Lk irradiate the respective groups. The preliminary. LD-50 (at 30 aa are near completion and will give data on cataract induction, and marrow activity, as indicated by Fe-59 uptake in red bleod cells cell counts. Tentative neutron/x-ray ratios obtained for acute 1 are: Mice, 1 rep neutrons, or 3. rep x-rays; 3.0 rep x-rays; Rats, 1 rep neut and Guinea Pigs, 1 rep neutrons or 2,3 rep x-ra Detection of Radiation Injury. (UNCLASSIFIED) Investigator within 2) hours, The acid "DN-ase" in the urine of rats ‘showed a fivefold increase after irradiation. Under the same conditions, neut “DN-ase* also:increased and remained elevated. These findings i assist in the early diagnosis of pancreatic malignancy5 hitherto cult to determine. National EE of Health, a number of research projects |on: of irradiation on subhuman primates have been initiated recently. University of Wisconsin is conducting one such study on theeffec which have been tamed and adapted to test situations. These studfes are to be continued on a relatively long-range basis, and it is e that the information will be of value in determining whether the processes are seriously affected by radiation. Radiaticn Instruments Program High Intensity Probe. (UNCLASSIFIED) A demonstration was repently witnessed at the Naval Research Laboratory of a new high intensi probe being developed by Victoreen Instrument Company for use in their Roentgen Rate Meter. The probe is designed .to extend the range of the Rate Meter ‘to 1.8 megaroentgens per hour, and has possible applications in 4 ne new: field of food irradiaticn and in instrumentation associated with kKilocurie and megacurie gamma sources,