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An ionization chamber using compressed xenon has been designed and built for gamma-ray spectrometry. The device is based on signal measurement from a parallel plate detector, with the gas enclosure constructed specifically for packaging into a portable instrument; thus, appropriate engineering practices using ASME codes have been followed. The portable system comprises two small containers that can be setup for operation in just a few minutes. Its sensitivity is 100 keV to over 1 MeV, with a resolution at 662 keV of 2.5% FWHM for uniform irradiation, and 2% FWHM for collimated irradiation, comparable to the best ever with compressed xenon. It also exhibits greater specificity than most scintillators, such as NaI. The device is insensitive to neutron damage and has a low power requirement.

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This paper presents data on the solubility of mercuric oxide (yellow) and basic mercuric chloride (2HgO-HgCl2) in dilute solutions of hydrochloric acid. The data on the mercuric oxidehydrochloric acid equilibria are similar to those obtained in a study of the mercuric oxide-nitric acid equilibria2 which involve the hydrogen ion effect, but these have the additional interest in that they include the reaction with the chloride ion. Hence, the following equilibria are involved in interpreting the mercuric oxide-hydrochloric

A pol, arized neutron beam and a polarized target have been used to determine spins of 15 intermediate structure groups observed in the fission of 237Np below 1 keV and of 94 resonances observed in transmission below 102 eV. The pulsed neutron beam, from the Chk Ridge electron linear accelerator, was polarized by transmission through a dynamically polarized proton sample. The 2~N p, in the ferromagnetic compound NpA12, was cooled by a 3He-4He dilution