Assertion: ionizing radiation's effect | /r/CapableOf | control population
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text: Below this threshold, the effects in exposed populations are similar to control populations who have received only background radiation.4 Deterministic effects are caused by cell killing, and the severity of the effect increases as the dose above the threshold increases.7,18,19 Cell killing can produce death; growth retardation; abnormal brain/central nervous system (CNS) development, including mental retardation and behavioral disorders; abortion; malformation; and cataracts.16,19