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Health Risks of Ionizing Radiation: - Clark University

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39% <strong>of</strong> thyroid nodules were malignant, in<br />

contrast to 5% malignancy in the general<br />

public<br />

Median thyroid dose 24<br />

Gy (range 10-42 Gy)<br />

Cohort study <strong>of</strong> secondary thyroid neoplasms<br />

in 33 childhood cancer survivors, 1970-1998<br />

Acharya et<br />

al. 2003<br />

All leukemia RR 2.0 (90% CI 1.0-4.2)<br />

Estimated average bone<br />

marrow dose 7.1 Gy<br />

Case-control study (195 cases and 745<br />

controls) <strong>of</strong> leukemia risk following therapy<br />

for cervical cancer in Europe and North<br />

America<br />

Boice et al.<br />

1987<br />

Significantly increased risks <strong>of</strong> non-CLL<br />

leukemia and cancers <strong>of</strong> the rectum,<br />

bladder, stomach, and vagina 1<br />

Organ doses 2 Gy<br />

(stomach and kidney) and<br />

30-60 Gy (bladder and<br />

rectum)<br />

Case-control study (4188 cases and 6880<br />

controls) <strong>of</strong> second cancer risk following<br />

therapy for cervical cancer in Europe and<br />

North America<br />

Boice et al.<br />

1988<br />

Danish cohort: RR 2.80 (1.79-4.17) for all<br />

cancer, 66 (34-115) for retinoblastoma, 19<br />

(3.9-56) for cancers <strong>of</strong> connective tissue<br />

Gonad dose 1 cGy-45 Gy<br />

depending on primary<br />

cancer 2<br />

Cohort study <strong>of</strong> genetic disease in 6,847<br />

children <strong>of</strong> childhood cancer survivors in the<br />

US and Denmark 1970-86 (US) and 1943-96<br />

(Denmark)<br />

Boice et al.<br />

2003<br />

US cohort: cancer prevalence ratio 1.4<br />

Thyroid carcinoma RR 80 (50-120)<br />

Average thyroid dose 7.0<br />

Gy<br />

Cohort study <strong>of</strong> thyroid adenomas and<br />

carcinomas in 4,096 childhood cancer<br />

survivors in France and the UK, 1942-1985<br />

De Vathaire<br />

et al. 1999<br />

Doses not reported (high) RR 4.3 (3.0-6.2); risk highest in children<br />

first diagnosed before age 5<br />

Case-control study <strong>of</strong> second cancer in<br />

25,120 childhood cancer survivors (Nordic<br />

countries 1960-1991)<br />

Garwicz et<br />

al. 2000<br />

Medical Exposures 41<br />

1<br />

RR (90% CI) 2.02 (1.0-4.2; non-CLL leukemia), 1.83 (1.2-2.8; rectum), 4.05 (1.9-8.5; bladder), 2.08 (1.1-4.0; stomach), and 2.65 (1.0-6.3; vagina).<br />

2<br />

<strong>Radiation</strong> therapy for craniospinal tumors or neuroblastoma, for example, resulted in gonad doses <strong>of</strong> 2-125 cGy while treatment for Hodgkin’s disease,<br />

involving abdominal exposure, resulted in gonad doses <strong>of</strong> 2-45 Gy.

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