Helen Vaughn Michel (born 1932) is an American chemist best known for her efforts in fields including analytical chemistry and archaeological science, and specific processes such as

neutron activation analysis Neutron activation analysis (NAA) is the nuclear process used for determining the concentrations of elements in many materials. NAA allows discrete sampling of elements as it disregards the chemical form of a sample, and focuses solely on atomic ...

and

radiocarbon dating Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was dev ...

. Her work with

Frank Asaro Frank Asaro (born Francesco Asaro, July 31, 1927 – June 10, 2014) was an Emeritus Senior Scientist at the Lawrence Berkeley National Laboratory associated with the University of California at Berkeley. He is best known as the chemist who discove ...

at the

Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory (LBNL), commonly referred to as the Berkeley Lab, is a United States national laboratory that is owned by, and conducts scientific research on behalf of, the United States Department of Energy. Located in ...

at the University of California (Berkeley) is particularly noteworthy as it includes the dating of

Drake's Plate of Brass The so-called Drake's Plate of Brass is a forgery that purports to be the brass plaque that Francis Drake posted upon landing in Northern California in 1579. The hoax was successful for 40 years, despite early doubts. After the plate came to publ ...

as well as the

Alvarez hypothesis The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth. Prior to 2013, it was co ...

, the hypothesis that posits the

Cretaceous–Paleogene extinction event The Cretaceous–Paleogene (K–Pg) extinction event (also known as the Cretaceous–Tertiary extinction) was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago. With th ...

. Michel retired from the Lawrence Berkeley National Laboratory in 1990.

References

Living people 1932 births 21st-century American chemists University of California, Berkeley alumni University of California, Berkeley faculty Lawrence Berkeley National Laboratory people American women chemists 21st-century American women scientists {{US-chemist-stub