pe 2. Ion-chamber-type survey meter: calibration Operation, use, afr 3. Geiger-Mueller-type survey meter: and calibration 4. Shieldingproperties of common materials: Effect bf various absorbers of gamma radiation and determinafkion Operation, use, of their absorption coefficient and half-thickness 5. Maintenance of instruments: Basic concepts of maig- tenance and some of the details of maintenance app]ji- cable to the Geiger-Mueller counter and ion-chambegtype instruments 6. Decontamination: Familiarization with some of the methods used in the decontamination of radiologically contaminated materials, use of a few of these meth ods, and comparisons of the results 7. Field monitoring: Practice in monitoring of large contaminated areas and plotting of isointensity links by comparing the results of rapid and detailed surveys 8. Problems: Introduction to the calculations necessa for the solution of exposure and time-of-stay problems through the use of radiation-calculator slide rules and tables. The second and third schools at Bikini and Enewetak were at fended by much smaller groups that received a l-day condensed version of cises. e exer- These secondary courses were considered emergency supplementary instruction. Instructors were TU 7 personnel. The lack of continuity in operations and the loss of experienced personnel between operations necessitated the establishment of a trhining program for unit laboratory technicians, photodosimetry technicifins, and radiological-instrument repairmen. Schooling for instrument repgirmen was arranged through JTF 7 and AFSWP at the Naval Schools Command, Tgeasure Island, San Francisco, and consisted of 1 month of instruction i} Maintenance and repair of military radiac instruments. the All TG 741 repair- men were graduates of this school. Arrangements were made with the Nucleonics Branch of the Sigrfl Corps ‘Engineering Laboratories to conduct familiarization courses with fnobile field laboratories for the laboratory and photodosimetry techniciBns. 91