: The most recent major revision is ISO/ASTM 51939:2017 , which updated the format and narrowed the focus to self-contained photon irradiators, removing older teletherapy and electron beam sections. Other Notable Contexts for 51939
The number is primarily associated with ISO/ASTM 51939 , an international technical standard and practice for blood irradiation dosimetry . ISO/ASTM 51939: Blood Irradiation Practice : The most recent major revision is ISO/ASTM
: It applies to self-contained irradiators using radionuclides like Cesium-137 ($^{137} ^{60}$Co) , or X-radiation. : The most recent major revision is ISO/ASTM
: A page citation in the U.S. Federal Register regarding proposed rules by the Bureau of Economic Analysis for international services surveys. : The most recent major revision is ISO/ASTM
