Practice question

Radiation effects on human health require dose equivalent that accounts for absorbed energy, radiation quality, and tissue sensitivity. Sievert, SI unit, multiplies gray by quality factor and tissue weighting factor, yielding effective dose in joules per kilogram weighted for stochastic risks like cancer induction. Curie measures activity, roentgen measures exposure charge in air, and rad is older absorbed dose unit. Regulatory limits for occupational exposure and field biology safety are expressed in sieverts, providing direct estimate of biological risk to human tissues from diverse radiation sources.