-3Radiation Physics laboratory 7. Radiation Monitoring System (AEC Project 2971) L. Costrell, Chief Nucleonic Instrumentation Section This project is for the development of a system for the monitoring of fall out from atomic bomb bursts. Several remotely located detector stations are interrogated over a radio link by the operator at the control station. In response to this interrogation, the detector stations radio the desired data back to the control station where it is displayed visually and also automati- cally stamped on a digital recorder. View of Main Laboratory Bay. 9. Film Dosimetry (partly supported by AEC Project 2921) and (Photographic Emulsion Sensitivities) G. Ehrlich Investigation of emulsion properties and processing procedures, development of a dosimeter designed to measure the prompt radiation from an atomic explosion, and intercomparison of the present personnel monitoring services of the various AEC health physics installations, 10. Evaluation and Testing of Radiation Instruments (AEC Project 2921) F. H. Day Study of new types and developmental prototypes of radiation detecting and measuring instruments including energy dependence, dose rate dependence, and over-all operational characteristics. The calibration of dosimeters and survey meters using 7-curie Cobalt—60 sources as well as the 500 and 1400 kv X-ray generators. ll. Cavity Ionization (partly supported by AEC Project 2909) F. H. Attix Study of cavity ionization chamber response as a function of wall material and photon energy leading to development of secondary standard and strongly energy dependent chambers. Measurement of Very Soft and High Intensity X-rays F, H. Day Low energy guarded-field ionization chamber used for determining chamber design criteria as well as for regular calibration of instruments in the 5 - 50 KV range and at dosage rates up to 100,000 roentgens per minute,