PAEC also sponsored the research program in the field of radiochemistry and biochemistry. She worked without salary as a "guest" in Hahn's department of Radiochemistry. This investigative methodology combined radiochemistry and other techniques to gather intelligence on nuclear activities. Otto Hahn is credited for promoting the use of coprecipitation in radiochemistry. She was appointed group leader of the experimental nuclear and radiochemistry group in 2013. In this way, he contributed to the understanding of the radiochemistry of the actinide elements. For further details please see the page on radiochemistry. Sg are advantageous for radiochemistry&colon; they are produced in the Cm(Ne,5n) reaction. The lanthanum-140 was isolated in a radiochemistry building, TA-10-1. Another application is in radiochemistry, where this may refer to isotopic ratios or isotopic abundances. Much of radiochemistry deals with the use of radioactivity to study ordinary chemical reactions. Besides his work in the factory, Giesel's focus was on radiochemistry. Radiochemistry includes the study of both natural and man-made radioisotopes.