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Concentrations of 6°Co, 137Cs, gross alpha, gross beta, strontium, and 22STh in environmental samples collected at the 7500 Area Contamination Site ...

No abstract

activities. This report (ORNLER-326Rl) was prepared to ensure safety of personnel and the environment during remediation activities at the Molten Salt Reactor Experiment. This work was performed under Work Breakdown Structurel. 12.06.10.02.01 (ActivityDataSheetADS3700) "ORNLDecontamination and Decommissioning Program." The report details required health and safety documentation, roles and responsibilities of health and safety personnel, potential site hazards, site access requirements, frequency and types of monitoring, site work zones and control measures, decontamination procedures, standard operating procedures, and emergency contingency plans.

In thefirst experimenttouse thesuperconducting RF cavity at LAMPF known as the Scruncher, crosssections have been measured forthe 1+ doubletin 12C by 50 MeV lr _ scattering. The crosssection ratioof the isoscalar to the isovector states was found to be 6.84-1.3forlr + scattering and 3.94-1.4for_r-scattering. These ratios givean isospin mixing matrixelement"Holof 119 4-40 keV, in good agreementwith the averagevalueof 123 4-26 keV deduced from previous pionscattering dataand withvalues deducedfrom otherprobes.The ratio oflr + + p to _r-+ p crosssections was determined experimentally tobe 2.604-0.11, inagreement with a theoretical value,)f 2.85.The agreementof theseresults indicates thatthe impulse approximation is valid at 50 MeV. Cross sections were also measured for the elastic and collective states in 12C and were generally described well by distorted wave Born approximation calculations published previously. Chapter Previous pion-scattering experiments conducted at 50 MeV and reported by Jaki et al. [Jak 90], Morris et al. [Mor 81] and Ritchie e t al. [Pdt 90] disagree on the value of 7_01, with experimental values ranging from 25 keV [Pdt 90] to 157 kev [Jak 90]. The ratio of the T = 0 to T = 1 cross sections R is also of importance. Using isospin impulse approximation arguments explained in Chapter 2, the theoretical value of R at resonance energies will be seen to be 4. Previous experimentally determined values of R have been found to be about 1. The purpose of this experiment was to provide more data in order to determine the value 7401 and the validity of the impulse approximation.