Editing Sievert (section)

===Deterministic effects===
[[File:Effectofselfrepair.svg|thumb| This is a graph depicting the effect of [[dose fractionation]] on the ability of [[gamma rays]] to cause cell death. The blue line is for cells which were not given a chance to recover; the radiation was delivered in one session. The red line is for cells which were allowed to stand for a time and recover with the pause in delivery conferring [[radioresistance]].]]
The deterministic (acute tissue damage) effects that can lead to [[acute radiation syndrome]] only occur in the case of acute high doses (≳&nbsp;0.1&nbsp;Gy) and high dose rates (≳&nbsp;0.1&nbsp;Gy/h) and are conventionally not measured using the unit sievert, but use the unit gray (Gy).
A model of deterministic risk would require different weighting factors (not yet established) than are used in the calculation of equivalent and effective dose.