TABLE 3.

Percentages with Frequencies of Medical Radiation Exposures by Atomic Bomb Radiation Dose

	DS02R1 weighted absorbed colon dose
	<0.005 Gy	0.005 to <0.1 Gy	0.1 to <1.0 Gy	≥1.0 Gy
	(n = 5,762)	(n = 4,416)	(n = 2,226)	(n = 266)
Total CT scans (%)a
0	21.4	23.0	23.1	15.8
1–5	54.4	53.0	52.1	51.5
6+	18.0	18.2	18.9	24.1
Unknown	6.2	5.8	6.0	8.7
Head CT scans (%)
0	40.4	40.4	41.2	33.5
1–2	35.7	34.7	34.8	36.1
3–5	13.1	13.7	12.7	15.8
≥6	4.1	4.5	4.2	5.3
Unknown	6.7	6.7	7.1	9.4
Chest CT scans (%)
0	45.6	47.9	46.8	39.1
1–2	24.9	24.1	23.6	21.1
3–5	11.4	10.4	11.7	15.4
≥6	7.0	7.7	7.4	10.2
Unknown	11.1	10.0	10.6	14.3
Abdominal CT scans (%)
0	54.1	55.1	53.7	43.6
1–2	21.5	21.1	20.6	25.2
3–5	8.7	8.8	8.9	11.7
≥6	4.8	4.9	5.3	6.4
Unknown	11.0	10.1	11.6	13.2
Total fluoroscopy examinations (%)b
0	20.3	18.3	21.4	27.1
1–5	50.9	50.7	49.2	45.5
≥6	22.6	25.4	22.5	19.6
Unknown	6.2	5.6	6.9	7.9
Upper GI fluoroscopy (%)
0	24.0	21.5	24.8	32.0
1–2	27.7	28.1	27.5	23.7
3–5	21.4	20.7	19.9	18.1
≥6	19.0	22.5	19.7	16.5
Unknown	7.9	7.1	8.2	9.8
Lower GI fluoroscopy (%)
0	59.4	60.0	59.7	54.9
1–2	25.9	26.0	25.6	29.7
3–5	6.8	6.2	5.4	6.8
≥6	1.8	1.9	1.6	1.9
Unknown	6.1	5.9	7.8	6.8
Total angiography examinations (%)c
0	73.0	74.2	72.5	62.4
1–5	17.4	16.9	17.8	24.8
≥6	2.3	1.8	2.1	2.3
Unknown	7.3	7.1	7.6	10.5
Cerebral angiography (%)
Never	84.4	85.1	84.1	75.2
Everd	8.0	8.0	8.0	11.3
Unknown	7.6	6.9	8.0	13.5
Coronary angiography (%)
Never	80.1	81.8	80.0	72.9
Ever d	13.5	12.1	13.3	16.5
Unknown	6.5	6.1	6.7	10.5
Hepatic angiography (%)
Never	89.0	89.7	87.7	84.2
Everd	3.6	3.1	3.6	5.3
Unknown	7.4	7.2	8.7	10.5
Radiotherapy (%)
Never	84.6	84.7	83.7	74.8
Ever	7.3	7.5	7.5	12.0
Unknown	8.1	7.8	8.8	13.2
Total (%)	100	100	100	100

^aHead, chest and abdominal CT scans.

^bUpper and lower gastrointestinal (GI) fluoroscopy examinations.

^cCerebral, coronary and hepatic angiography examinations.

^dThree responses (1–2, 3–5 and ≥6 times) were combined because the proportions of responses, 3–5 and ≥6, were small.