The rate of chromosomal aberration in the workers working in grass root hospitals(0.421%) was higher than those working in upper level hospitals(0.083%).
基层医院放射工作者染色体畸变率（0.421%）明显高于上级医院（0.083%）。
Reduction of chromosome number and decrease in chromosomal aberration rate.
染色体数量明显减少，畸变率下降；
Reduction of chromosome number and decrease in chromosomal aberration rate.
染色体数量明显减少，畸变率下降；
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