The design and construction of a synchronous-scanning underwater imaging system capable of rapid two-dimensional scanning are described. The imager employs a 7-W, all-lines, argon-ion laser in onjunction with a galvanometrically driven raster scanner and an image-dissector tube receiver. The imager is capable of directly generating real-time RS-170 video imagery. The results of an in-water test of the imaging system, in which a high-contrast imaging test pattern was imaged, demonstrate operating anges of up to 4 attenuation lengths (AL) when the test was run at real-time frame rates, ranges of 5.1-5.5 AL when the system operated with an eight-frame running average, and ranges of 6.3 AL when a 128-frame running average was used. The system performance was compared with that of several floodlight/silicon-intensified-target TV camera configurations, which produced a maximum imaging range of ∼2.6 AL. Also, an imaging configuration that used the raster-scanned beam of the laser as an illumination source for the sil n-intensified-target camera was tested. That system had an ultimate range of ∼ 4 AL.
ltvttTunrnt.il neutron activation analysis Is a technique of tract* analvsts unity! measurements of radloai tlvity induced in the sanplo by exposure to a snufcf of neutrons. The Induced activity ts measured by the emitted samma radiation K.u h itae-aa caliccr can then be identified by the i*ncr>:v of the photopeaks produced ;ts the nuclide decays and by the ha If-life of the neutron-induced activity. A raspk'X computer projsr.ua CAMAMAi. has hecn used to accomplish the major '.asks of nuclide Identification and •juant I f ication. The nuclide data out put frtw t.AMANAI. is proceSited bv a second conputer code XADAC, which develops elemental abundance data from disintegration races observed. The methods are those employed at the I.fvemore Pool-Type iteactor In sup port of the i'.nvironmental Research PrnRran. As-one. the procedures described and discussed are sample preparation, irradiation, analysis, and application of the technique.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.