Induction of Thyroid Cancer by Ionizing Radiation (N C R P by National Council on Radiation Protection PDF

By National Council on Radiation Protection

ISBN-10: 0913392723

ISBN-13: 9780913392720

ISBN-10: 1435629485

ISBN-13: 9781435629486

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Additional resources for Induction of Thyroid Cancer by Ionizing Radiation (N C R P Report)

Example text

6. Experience with Iodine-125 Iodine-125 is used extensively in radioassay techniques for both research and clinical purposes. It has also been used occasionally in the past for treatment of hyperthyroid states. Thyroid cancer following human thyroidal exposure to large amounts of 1251 has not been reported. This may reflect, in part, the small numbers of such subjects available for study and short followup times. Therefore, it is necessary to look a t results from animal studies and a t non-malignant effects in man.

Under these conditions, the initial activity in the thyroid responsible for producing this total dose would depend upon the individual radioisotope. 1E provides the results for a value of the total dose equal to 100 rads. 1A-Thyroid to thyroid S values, physical half lives, and effective hay times Rsdionuclide S Valuea (rad/&i. ~ Effectwe Half Time in the Thymid -Tc '='I 'I '"I ' SI '"I ' 9 '"I 'From (Snyder, 1976) with the exception of that for '"I which was determined directly from the '"I: Nuclear Data Sheets (1975).

4 million person-rad-years with an estimated spontaneous rate of clinically detectable thyroid cancer of about 3. 69 cases per million person per rad per year for children and adults respectively. 05. In fact, no excess cancers were determined to be present. The calculation in the case of children is less certain due to the small numbers and lack of precise information regarding their actual spontaneous rate of thyroid cancer as they reach adult life. Thus, in summary, I3'I appears less carcinogenic in people on a radfor-rad basis than external radiation.

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Induction of Thyroid Cancer by Ionizing Radiation (N C R P Report) by National Council on Radiation Protection

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