Since the presence of a small amount of air is unavoidable in large drift chamber detectors, we present a study of the effect of {ital N}{sub 2} contamination on the electron drift velocity in a working Forward/Backward Muon Chamber placed in the MIT cyclotron magnet. The nominal gas mixture, Ar:CO{sub 2}:iC{sub 4}H{sub 10} (86:10:4), was varied by including as much as 1% N{sub 2}. Results at B=0 and 0.5T are shown.

This Environmental Radiation Monitoring Plan (ERM) discusses sampling soils, vegetation, and biota for depleted uranium (DU) and beryllium (Be) at Yuma Proving Ground (YPG). The existing ERM plan was used and modified to more adequately assess the potential of DU and Be migration through the YPG ecosystem. The potential pathways for DU and Be migration are discussed and include soil to vegetation, soil to animals, vegetation to animals, animals to animals, and animals to man. Sample collection will show DU deposition and will be used to estimate DU migration. The number of samples from each area varies and depends on if the firing range of interest is currently used for DU testing (GP 17A) or if the range is not used currently for DU testing (GP 20). Twenty to thirty-five individual mammals or lizards will be sampled from each transect. Air samples and samples of dust in the air fall will be collected in three locations in the active ranges. Thirty to forty-five sediment samples will be collected from different locations in the arroys near the impact areas. DU and Be sampling in the Hard Impact and Soft Impact areas changed only slightly from the existing ERM. The modifications are …