The attenuation of solar radiation by the atmosphere between the heliostat and receiver of a Central Receiver solar energy system has been computed for a number of atmospheric conditions and tower-heliostat distances. The most important atmospheric variable is found to be the atmospheric aerosol content. No dependence of atmospheric water vapor is found and only a weak dependence on solar zenith angle. For a 500 m heliostat-tower distance two to four percent reductions are expected under typical desert conditions (50 to 120 km visibility). The reduction is approximately linear with heliostat-tower distance. A representative value of the attenuation coefficient is 0.051 km/sup -1/.

The attenuation of solar radiation by the atmosphere between the heliostat and receiver of a Central Receiver solar energy system has been computed for a number of atmospheric conditions and tower-heliostat distance.

The DT fusion neutron irradiation of an AI sample capsule containing cobalt, zirconium, gold, iron, nickel and niobium samples plus two LLL pyrographite samples, and eight LLL silica pieces is described. The sample position, beam-on time, and neutron dose record are given. The maximum neutron fluence on any sample was 2.41 x 10/sup 17/ neutrons/cm/sup 2/.

The DT fusion neutron irradiation of eight LLL Nb-lZr tensile specimens, two BPNL wire-foil packets, eleven BNL-LASL superconductor wires, four LASL high purity single crystals (one each of YAG, Spinel, Al/sub 2/O/sub 3/ and MgO), seven LLL Suprasil and several LLL micro cover glasses. The sample position, beam--on time, and neutron dose record are given. The maximum neutron fluence on any sample was 4.68 x 10/sup 17/ neutrons/cm/sup 2/.

The DT fusion neutron irradiation of nine LLL stainless steel samples (including six tensile specimens), four LASL high purity single crystals (one each of MgO, YAG, Sapphire and Spinel), ten LLL silica samples, and seven LLL calcium fluoride samples is described. The sample position, beam-on time, and neutron dose record are given. The maximum neutron fluence on any sample was 1.39 x 10/sup 17/ neutron/cm/sup 2/.

The DT fusion neutron irradiation of two LLL superconductor wires at 4.2/sup 0/K is described. The sample position, beam-on time, and neutron dose record are given. The results from four ''profile'' dosimetry foils measuring the lateral variation in neutron flux are included.

The techniques of stepwise laser excitation were applied to obtain Ryberg series in the lanthanides and in uranium. The methods employed circumvent many of the experimental difficulties inherent in conventional absorption spectrosopy of these heavy atoms with very complex spectra. The Rydberg series observed have allowed the determination of accurate ionization limits. The values in eV are: Ce, 5.5387(4);Nd, 5.5250(6); Sm, 5.6437(10); Eu, 5.6704(3); Gd, 6.1502(6); Tb, 5.8639(6); Dy, 5.9390(6); Ho, 6.0216(6); Er 6.1077(6); U, 6.1941(5). A comparison of the f/sup n/s/sup 2/-f/sup n/s ionization limits as a function of n with theoretical calculations is made.

Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John L. Hill, regarding a legal question submitted for clarification; Appointment of county commissioner's wife as deputy tax assessor-collector for the county.