radiation filter

https://doi.org/10.1351/goldbook.08757
Material interposed in the path of radiation to modify the energy distribution of the radiation.
Source:
PAC, 2021, 93, 69. 'Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)' on page 94 (https://doi.org/10.1515/pac-2019-0302)