conclusion based on data radiation weighting factor NCRP Glossary (https://ncrponline.org/wp-content/themes/ncrp/PDFs/NCRP-Composite-Glossary.pdf) Jack Miller Radiation weighting factors may change as more data on biological effects are obtained. A factor used to allow for differences in the biological effectiveness between different radiations when calculating equivalent dose (H_T) (see equivalent dose). These factors are independent of the tissue or organ irradiated.