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.
From Wikipedia, the free encyclopedia. The cisterna magna (or cerebellomedullary cistern) is one of three principal openings in the subarachnoid space between the arachnoid and pia mater layers of the meninges surrounding the brain. The openings are collectively referred to as cisterns.he two other principal cisterns are the pontine cistern located between the pons and the medulla, and the interpeduncular cistern located between the cerebral peduncles. Cerebral spinal fluid can also be obtained by puncture of the cisterna magna (cistern puncture).