# Radiation Dose Motivation: dosimetry, yeah Radiation Dose is a way to quantify the amount of radiation created by the energy of ionizing radiation being absorbed by some substance. When radiation passes through the human body, some of it is absorbed, this is a way to quantify that. There's a lot of complicated things to remember with [[Radiation Dose Units]], but just know that there's conversion factors to consider for each organ if we really care about it. The common unit for radiation in the united States is the Gray (Gy), where 1 Gy is the equivalent of 1 Joule of energy deposited in 1 kg of material, where $1 J = 6.242 \times 10^{12} \, MeV$. Dose can be measured on site with a measurement from a gamma-spectrometer, or with other dosimeters, this is a whole field in and of itself.