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医源性照射包括用X线诊断与治疗,而医用放射性药物则列入放射性沾染的范畴。妊娠期间X线诊断是宫内照射最常见的。1966年美国的一项研究表明;当年在美国总计4,021,000孕妇中,1,086,000例(26％)接受过X线检查,478,000例(11％)进行过X线照片。这些检查中有54％是在妊娠第三期进行的,有25％在妊娠第二期,21％在妊娠第一期进行的。几乎所有产科X线检查,包括骨盆测量、胎盘造影和胎位测定照片都是在妊娠末期进行的。非产科放射检查约占10％,其中有肠胃造影、钡灌肠和胆囊造影等等是在妊娠
Iatrogenic irradiation includes the use of X-ray diagnosis and treatment, and medical radiopharmaceuticals are included in the scope of radioactive contamination. X-ray diagnosis during pregnancy is the most common intrauterine irradiation. A 1966 U.S. study found that of the 4,021,000 pregnant women in the United States that year, 1,086,000 (26%) had X-rays and 478,000 (11%) had X-rays. Of these tests, 54% were performed in the third trimester, 25% in the second trimester, and 21% in the first trimester. Almost all obstetric X-rays, including pelvis measurements, placenta angiography and fetal position measurements are taken during the last trimester. Non-obstetric radiation examination accounts for about 10%, including gastrointestinal imaging, barium enema and gallbladder imaging, etc. are in pregnancy