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These advances in stable istopic tracer measurements are important because of the limitations in lead radiotracer measurements. Tracer studies of lead metabolism using radioisotopes ( Pb, Pb, and Pb) have been hindered by the relatively poor precision of the measurements, their relatively short ( Pb tin = 51.88 hr and "Pb tm = 10.64 hr) or long ( Pb tin 22.3 yr) half-lives, and the relatively weak gamma energy of Pb. Additionally, concerns about the radiation hazard of these isotopes have severely restricted their utilization in many laboratory and clinical studies. 

Power is the rate at which energy is emitted, transferred, or received. Power can be produced and utilized in many different forms, such as electrical power, hydraulic power, and nuclear power. Power in these different forms is what makes a system work. System safety is concerned about power because most power sources are also hazard sources. One of the first steps in an HA is to identify all of the power sources and then consider all the possible ways these energy sources can contribute to different hazards. For example, electrical power can be a hazard source in hazards such as electrocution, failure to be present when needed, out of tolerance, applied prematurely or inadvertently. 

While stressing genetic risks, the National Academy report dted other existing and potential hazards of radiation. It pointed out that concern about fallout had obscured other sources of radiological contamination that could prove to be more serious as the application of atomic energy for peaceful purposes became more widespread. The construction and... 

Of all modem technologies, the highest potential for catastrophe in the public s mind is probably associated with nuclear power. The awesome destructive power of nuclear weapons provides reason for some to fear all things that utilize nuclear energy or emit radiation. The accidents at Three Mile Island (TMI) and Chernobyl strongly reinforced intuitive public concerns about nuclear power. In the U.S., the potential hazards of nuclear power were recognized very early, and some features to prevent, contain, and otherwise protect the public from reactor accidents were applied from the outset. 

Some of the concerns and problems with LCDs are being confronted by society as a whole. One concern is the high energy consumption of fluorescent lamps used by LCDs. In contrast, LED lights, which use less energy, are being used more and more in LCDs. There is concern, however, about the environmental hazards LEDs may create when they are disposed of in landfills. Another possibility is the use of carbon nanotubes, which would provide LCD... 

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