The Cu(p, X) Na cross section was measured at energies of 30, 150, 400, and 800 GeV.Proton Buences were determined with beam current transformer systems which were calibrated electrically in situ. The Na produced in Cu targets was assayed by comparing the intensity of its 1368-keV p ray with that of the 1332-keV y ray from Co standard sources. Results are consistent with an energy-independent cross section of 3.59 + 0.14 mb.
Measurements of induced radioactivity concentration in air were made at five target halls associated with the Fermilab high-energy proton synchrotron. A gas flow-through ionization chamber was used to continuously sample air released from an exhaust stack at each location. The radioactive decay of a grab sample of air from each target hall was recorded, and a best-fit of each decay curve was made via iterative steps to determine the mixture of radionuclides present. The radionuclides 11C, 13N, 15O, 38Cl, 39Cl, and 41Ar were identified. Two distinct radionuclide mixtures or "signatures" were found and were correlated to the geometry of the proton loss point. The normalized activity release rates for the five target areas agree within a factor of two of the average value of 2.7 muBq per proton for 800 GeV protons.
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