# Absorbed Dose **Entity class:** Radiation quantity ## Definition **Absorbed dose** is the energy imparted by ionizing radiation per unit mass of matter. It is distinct from the ambient radiation field and from biological-effect quantities that apply radiation weighting or tissue response. ## Relationships - **derived from:** [[wiki/Radiation Transport Field|Radiation Transport Field]], exposure duration, geometry, shielding, and receptor properties. - **evaluated within:** [[wiki/Receptor Layer|Receptor Layer]]. - **supports:** [[wiki/Person-Scale Exposure Estimation|Person-Scale Exposure Estimation]] and survivability analysis. ## Sources / Provenance - [NIST — SI Units: Radiation Dose](https://www.nist.gov/pml/owm/si-units-radiation-dose)