Source:http://linkedlifedata.com/resource/umls/id/C0597354
CSP: radiolabeled compounds; when a stable compound has an element replaced with a radioisotope it becomes radiolabeled; denotes the use of a radioisotope that is used to follow the metabolism, synthesis or route of a specific element or to study a biological process such as transport, immunological mechanisms, or cell divisions; index specific element that is being tagged.