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Double flood basalts and plume head separation at the 660 kilometer discontinuity, Science, 266, 1367-1369. Underlying fracture zone nature of Astrid Ridge off Antarctica, Queen Maud Land, J. Refined spreading history of the Southwest Indian Ridge for the last 96 Ma, with the aid of satellite data, Geophys. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.The term is also used more generally to characterize any type of exponential or non-exponential decay.Lead is one of only a few elements known to ancient peoples.One of the oldest examples of lead is a small statue found in Egypt.It was made during the First Dynasty, in about 3400 B. Mention of lead and lead objects can also be found in very old writing from India.And the Bible mentions lead in a number of passages.
Geological framework of the Kerguelen Plateau and adjacent ocean basins, Geoscience Australia Record 2002/05.
For example, the medical sciences refer to the biological half-life of drugs and other chemicals in the human body. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half-life in the early 1950s.
Rutherford applied the principle of a radioactive element's half-life to studies of age determination of rocks by measuring the decay period of radium to lead-206.
Throughout history, Lead has been used to make water and sewer pipes; roofing; cable coverings; type metal and other alloys; paints; wrappings for food, tobacco, and other products; and as an additive in gasoline.
Since the 1960s, however, there has been a growing concern about the health effects of lead.This timeline is for use with the article on environmental determinism.