目的:对申请职业性放射性肿瘤诊断的3例白血病进行诊断情况分析。方法:回顾分析3例放射工作人员职业史、患病史及病因概率PC值（probability of causation）计算资料。结果:2例患者经计算得到95%可信限上限的PC值>50%，诊断为职业性放射性肿瘤。1例患者95%可信限上限PC值50%, and they were diagnosed as radiogenic neoplasms. One case was <50% and diagnosed as nonoccupational radiogenic neoplasms.Conclusion:The probability of causation analysis has important guiding significance for the diagnosis of occupational radiogenic neoplasms. Radiological workers should improve their awareness of self-protection and reduce the occurrence of occupational diseases.