Plateau and Efficiency Checks on GeM Tubes . . . . 830 Service Calls on A-C Instruments... 4.60 0 0 © 237 The above vork covers approximately 394 instruments of 20 different types valued at about $100,000.00. c, Development and Construction Work (Main Items): Development and construction of 12 instruments (portabl act operated) for monitoring of tritium in the air, Conversion of Pee Wee for neutron monitoring (in collathration with Biophysics Section) - 6 instruments. Reduction of background of 8 Methane Proportional Counters used for plutenium urinalysia - average now 2.4 counts per hour. Development and construction of two flucrophotometers fcr uranium urinalysia, two ionization chamber instruments for tritiuz urinalysis, and one polarograph. Partial development of tvo types of continuous air monitors for alpha activity (ane based on the impactor principle, the other] a filter type). 3. Bigohyeics a. The Biophysics Sectio has moved to larger quarters in the basement of B Building during the year. The personnel of this Sedtion still cemtimed inadequate for the work load during the greater of the year. We have not succeeded in hiring an Alternate Leader ifor this Section, and have lost one Research Assistant, Gordon Pet who terminated this fall to begin vork toward his Ph.D. We have ll, od - 18 « 00130915 620 LOURKSS LANL