Some atoms are unstable and will undergo radioactive decay. When this happens, they emit ionizing radiation are often transformed into another element. This article explains how to calculate rates of radioactive decay. Atoms which are prone to radioactive decay are known as radionuclides. Radionuclides can occur naturally, or can be man-made â such as during the fission process in a nuclear reactor.
Sir Francis Drake with his new heraldic achievement, with motto: Sic Parvis Magna, translated literally: Thus great things from small things (come). The hand out of the clouds is labelled Auxilio Divino, or With Divine Help.
Cisterna magna. The cisterna magna (also known as the cerebellomedullary cistern) is the largest of the subarachnoid cisterns. It is located between the medulla anteriorly and the cerebellum posteriorly. The cistern receives CSF from the diamond shaped fourth ventricle via the median and lateral apertures.