Pac 1 f i c No r t hwes t La bo ratory R i cR1 and, Was h i ngton 99352 To be used in c o n j u n c t i o n w i t h t h e companion design manual, PNL-4069 ir c * -I . SUMNARY This document d e s c r i b e s the as-built construction and operating procedures f o r a well-logging instrument capable o f measuring t r i t i u m i n situ i n a well or bore h o l e as small as 3-inch schedule 40 pipe. A companion document, "A Design Manual f o r a Well-Logging Probe Capable of Fleasuring Tritium,"

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... L-4069, should be referred t o for all design information and drawings. T h i s document contains s e c t i o n s describing changes made between t h e design and construction phases, the general configuration o f t h e instrument, and step-by-step operati ng procedures. No. of Copies 5 C. Menninga