aacuc., or tee Ne a aS OE OO OO OULU OE OR internal emitters and external radiation exposure Corporate Source: Brookhaven National Lab., Upton, NY UL (USA) Conference Title: Radiopharmaceutical dosimetry symposium Publication Date: 1985 Conference Location: Report Number(s): Oak Ridge, p18 TN, USA SBULIUL UT LLCO Conference Date: 5 Nov 1985 BNL-37335; CONF-851113-3 Order Number: DE86006245 Contract Number (DOE): AC02-76CH00016 Note: Portions of this document are illegible in microfiche products Document Type: Report; Conference literature Language: English Journal Announcement: NTS8&603 Availability: NTIS, PC AOQ2/MF AOl1; Subfile: NTS (NTIS); INS (US 1. Atomindex input); ERA (Energy Research Abstracts). TIC (Technical Information Center) Country of Origin: United States Country of Publication: United States Abstract: In a study of the comparative effects of internal versus external irradiationof the thyroid in young people, we determined that the dose from internal irradiation of the thyroid with short-lived internal emitters produced several times less thyroid cancer than did the same dose of radiation given externally. We determined this finding for a group of 85 Marshall Islands children, who were less than 10 years of age at the time of exposure and who were accidentially exposed to internal and external thyroid radiation at an average level of 1400 rad. The external risk coefficient ranged between 2.5 and 4.9 cancers per million person-rad-years at risk, and thus, from our computations, the internal risk coefficient for the Marshallese children was estimated to range between 1.0 and 1.4 cancers per million person-rad-years at risk. In contrast, for individual more than 10 years of age at the time of exposure, the dose from internal irradiation of the thyroid with short-lived internal emitters produced several times more thyroid cancer than did the same dose of radiation given externally. The external risk coefficients for the older age groups were reported in the literature to be in the range of 1.0 to 3.3 cancers per million person-rad-years-at risk. We computed internal risk coefficients of 3.3 to 8.1 cancers per million person-rad-years at risk for adolescent and adult groups. This higher sensitivity to cancer induction in the exposed adolescents and adults, is different from that seen in other exposed groups. 14 refs., 8 tabs. Major Descriptors: *ADULTS -- NEOPLASMS; *CHILDREN -- NEOPLASMS; *EXTERNAL IRRADIATION -- RISK ASSESSMENT; *INTERNAL IRRADIATION -- RISK ASSESSMENT Descriptors: COMPARATIVE EVALUATIONS; HUMAN POPULATIONS; THYROID Broader Terms: AGE GROUPS; BODY; DISEASES; ENDOCRINE GLANDS; GLANDS; IRRADIATION; ORGANS; POPULATIONS Subject Categories: 560151* -- Radiation Effects on Animals -- Man 560161 -- Radionuclide Effects, Kinetics, & Toxicology -- Man INIS Subject Categories: C1500* -- Effects of External Radiation on Man C2110 -- Radioisotope effects, kinetics & toxicology in man 10/5/5390 01727076 Author(s): Title: (Item 290 from file: 103) AIX-16-080569; ERA-11-016225; EDB-86-050751 Oliveira, A.R. de Systematic register of nuclear accidents Original Title: Registro sistematico de acidentes nucleares Corporate Source: NUCLEBRAS, Publication Date: 1985 p 66 Rio de Report Number(s): INIS-BR-394 Order Number: RE86700747 Document Type: iReport; Numerical data Language: Portuguese Journal Announcement: NTS8511 Janeiro (Brazil) Availability: NTIS (US Sales Only), PC AO4/MF AOQl. 9003631