Definition(s)
Source
Origin of radiation, which is an x-ray tube or radioisotope.
Source: API RP 5A5, Field Inspection of New Casing, Tubing, and Plain-end Drill Pipe, Reaffirmed August 2010. Global Standards
Source
Flow into a system
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Source
Reason for the presence of a cause or defeating factor, or for the presence of the hazard itself. Sources can be operations (e.g., running casing), necessary equipment (e.g., pressure vessel, energized electrical panel, etc.), necessary materials (e.g. hazardous chemicals), etc.
Other Related Terms and Definitions:
ISO Guide 73 – Item or activity having a potential for a consequence (in the context of safety, source is a hazard).
Source: International Association of Drilling Contractors, Appendix 2 to Health, Safety and Environment Case Guidelines for Offshore Drilling Contractors, Issue 3.3.2, February 2010. IADC Guidelines