For equivalent dose, the unit corresponding to rads is the rem (roentgen equivalent man). If the absorbed dose is in grays then the unit for dose equivalent is sievert (Sv). Thus, 1 Sv = 100 rem. Roughly 1 rem is the average dose received in three years of exposure to natural radiation.
OK...Thanks...What is the half life of a seivert?
Is it classified as alpha, beta or gamma?
(this is the first time I ever heard of “seiverts”)