What is the tissue weighting factor for lung?

In the context of radiation protection and dosimetry, the tissue weighting factor reflects the relative risk of stochastic effects from radiation exposure to different tissues and organs. For the lungs, the established tissue weighting factor is 0.12, which is typically rounded to 0.1 in various guidelines.

A tissue weighting factor of 0 effectively means that this tissue does not contribute to the overall risk of developing radiation-induced cancer or other stochastic effects—an indication that lung tissue is not considered in the calculations for overall effective dose. However, in practice, based on current guidelines, the correct weighting factor for lung is indeed 0.1, acknowledging that while lung tissue does have some risk associated with radiation exposure, it is lower compared to other critical tissues.

Thus, the answer indicating a tissue weighting factor of zero does not align with the established understanding of the lung's contribution to radiation risk.