This report details activities of Hanford Engineer Works on Project 9536 during the week ending December, 1943. Tests are described which were run to determine means of eliminating the film which has been forming on tubes and slugs and causing excessive pressure drops.

This report addresses toxicity (largely chemical) of Manhattan Project materials from the point of worker protection. Known chemical toxicities of X material (uranium), nitrous fumes, fluorine, vanadium, magnesium, and lime are described followed by safe exposure levels, symptoms of exposure, and treatment recommendations. The report closes with an overview of general policy in a question and answer format.