tal dose per pulse was nominally 1.4 mr. The upper radiation dose was determined by chamber saturation characteristics; doge rates above 10,000 r/hr may be measured with reduced accuracy by applying appropriate correction factors to the data. The lower limit is set by the vacuum tube grid current and varies somewhat from unit to unit. The relative polar response of the chamber was determined by using gamma or X-rays of various energies. These data were obtained by operating chambers inside ogives (the forward POTENTIAL PLATES COLLECTOR PLATES FIBERGLASS INSULATOR ELECTRONIC CIRCUIT IMBEDDED IN POTTING COMPOUND TO ELECTROMETER GAID Lo 3" —| i B RI 66 K cl ot R2 ta 33K PAM -— +180V 7,189) RS 22K T2 \ 15K R3 ra =o MA = iSK SE t PULSE OUTPUT T c2 200 pufd = (ON ; CHAMGER | | j =+> t +6V 180 ma = Figure 2.4 Radiation traasducer schematic. element of the rocket containing telemetering equipment) with associated equipment and exposing them to gamma and X-rays of various energies at different polar angles. As shown in Figure 2.5, the low energy response was relatively high along the normal to the vehicle axis. This response was considered desirable to compensate for low energy attenuation in other directions. Integration cf the 1.3 Mev curve indicated that the integrated response was 85 percent of that due to a point source producing the same field but loceted on a line passing through the center of 17