# Quality Factor (Q) Motivation: [[Radiation Dose]] baby The quality factor, Q, is a dimensionless modifier used in converting absorbed dose [Gy or rad] to dose equivalent [Sv or rem]. This measures the biological effectiveness of different types radiation in varying organs [^1]. [^1]: https://pubmed.ncbi.nlm.nih.gov/3410691/#:~:text=The%20quality%20factor%2C%20Q%2C%20is,of%20different%20kinds%20of%20radiation. $H = QD $ Where $H$ is the dose equivalent, $D$ is the absorbed dose, and $Q$ is the quality factor. Heavier particles, like heavy charged particles ($\alpha$ particles for example) will have a larger $Q$ factor than say, x-rays or $\gamma$ rays.