~-h- Tissue Breakdown Following Radiation. At (UNCLASSIFIED) University of Rochester School of Medicine some interesting stud are in progress which include the assessment of tissue breakdown (based on hippuric acid synthesis) occurring in animals subse ‘to exposure to ionizing radiation. This group is attempting tissue degradation by determining the release of glycine and s in biological equilibrium, with this amino acid from tissue pro Labeled with glycine-2-cl4 prior to exposure to ionizing radiapion. Tt has been demonstrated that total body x-irradiation (7 roentgens ) causes a significant increase in the isotope concentration of Bippuric acid during the first six hours following radiation exposure if rats given Several doses of glycine-2-CLh prior to the exposure. This sufgests that the tissue breakdown is initiatedby ionizing radiation. Addifional experiments using benzoic acid - carboxyl cll indicate that radibtion does not interfere with benzoic acid conjugation, Magnetic Spectrometer for High IntensityMeasure. (UNCLASSIFIED) A magnetic spectrometer capable of measuring gamma rays of high intensity has been designed and constructed under an AEC-National Bureay ofStandards research project. Its completion represents a part of the to of the Commission to improve quantitative methods for meas in the high intensity regions. The gamma rays having energies up to 12 MEV impinge on a effort radiation fthin Photon energies in the range of .2 to 12 MEV can be measured accuracy of 2 per cent. Intensities of photons can be dete an accuracy of 10 per cent. Measurements of weak photon sourfes are more made to boost the detector counting rate for a given source sfrength. In spite of its relatively low sensitivity for photon measurefients, the Spectrometer has certain advantages over other types. It co range that bridges the ranges covered, for example, by a spe using photoelectrons and one using pair electrons. For suffi intense sources, it is capable of operating with good resolu if the electron trajectories are accurately known, the photo over this wide energy range can be determined from the spect measurements by a direct method. Civil Defense Activities test Program for Future Operations. A convened by the Armed Forces Special Weapons Project in Janu