Six types of instruments are being considered for the metering of flow and/or density in high temperature (300 deg C) and pressure (2000 psi) slurry flow systems. Three of these meters yield readings that depend only on the flow rate or the density, one (the Double Rotameter) yields two readings from which both the flow and the density may be determined while another (the venturi) yields a reading that depends on both the flow rate and the density and thus may be either a density-meter or a flowmeter depending on which variable is the unknown. The remaining instrument (the ultrasonic meter) may yield a signal dependent solely on the flowrate or the density depending on the physical setup. This memo briefly describes these instruments, listing their particular advantages, the difficulties that may arise in their use and the state of development of each. (auth)

Topics discussed include procedures for the determination of Po in urine, feces, and blood; the determination of Be in biological materials; application of statistical methods to bio-assay; techniques for low-level alpha counting and pulse-height analysis; the toxicology of plutonium; the metabolism and toxic effects of fission products; methods for the radiometric determination of I/sup 131/ and Sr/sup 90/ in urine; procedures for the radiochemical analysis of Sr and Ba in human urine; and the design and performance of a wholebody gamma counter. (See also NLCO-595.) (C.H.)