4 in the exposed group. It is not known whetherthis finding,is of any significance in relation to their radiation exposure. Slit-lamp observations showed no opactics of the.lens characteristic of radiation Dental surveys red no‘Significant differences in eithertaries @&te or incidence of péridontaldisease betweneee and unexposed-groups. The poor.oral hygitpe, generally observed in the Mar- shallese"hedtel sual results, namely, highcaries rate im tg¢fieagechildren, severe peridentaHesions in aduflg. Reavy calculus and loss of afvéolar bone), aniedentulous mouths‘in the aged. Radiation exposure did not appear to Have affected developingdentitioniin the exposed children. Late effects of radiation. Various,parametets usualfy associated with aging were measured or estimated on a 0 to 4+ scale (skin looseness, elasticity, and senile changes; greying of the hair and balding; accommoadatiog,, Visualacuity,afd afcus senilis; hgaring; cariovascularchanges,including blood pressureasiee-degrees-Fperip “and retinal arteghoscltrosie; Treuremuper function: and hand strength). Comparison of these measurements in exposed and unexposed individuals of the same age groups showed Bg apparent differettces. A biological age score was@@fgulated for individfials and groups by use omavegage perc €. Liféshortening e fetter radtatien Have nolheen apparent. As noted, the méteflity ratewaexbout the Sarite iin the exposed as in the unexposed people. Theonecase ofcancer that developedin.od exposed group occurred at 5 years aftercathiela too soon:it is believed, to bear any particuli*telation to radiation exposure. Leukemia surveys including physical findings, studies of white cell counts and types, alkaline phosphatase staining, and basophil counts of 4000 white cells showed no ykemia or leu sestendency.One No apparent radiation-induced genetic changes have been detected on routine physical examination in the first-generation children of exposed parents. If the suggestive evidence of increased miscarriages andstillbirths in the exposed women istrue, this mayrepresent a genetic effect of exposure. BETA IRRADIAHON OF THE SKIN It was impossible to get an accuagite estimate of the radiation dose tethe skin, Befa Burns of the skin and epH#atagjn appeared abe@ut:-2 weeks after exposure, largely on ae of the body not covéred by clothing. About of the people had these burns, and a smaller.qumber@eveloped spotty epilation of the scalp. Most of the lestong were superficial; ene) exhibiged. Fdry. scaly desqua matfo®, gaiee little pain. Rapid ra desquamation, and were more painful. A few burns becamesecondarily infected and had to be treated with antibiotics. Repigmentation of the lesions gradually took place in most instances, and the skin appeared normal within a few weeks. However, in about 15% of the people, deeper lesions, particularly noted on the dorsum ofthe feet, continued to show lack of repigmentation with varying degrees of scarring and atrophyof the skin. By 6 years the only residualeffects of beta radiation of the skin were seen in 10 cases which showed varying degrees of pigment aberrations, scarring, and atrophy at the site of the former burns. Numeroushistopathological studies have _ been made,'** and the changes found have been _ consistent with radiation damage. At no time have changes been observed either grossly or microscopically indicative of malignant or premalignant change. Spotty epiigsen,on lived, regrowth o page after exposure andcoil the heads wasshort | hair by six months. Nadeggrther, Hen has been seen. “Ss paréngine aed Ps in the exposed people. No radia#lon-induced cataracts have been observed in any.oftheseappesed people. Genetic effects have not been specifically studied because of the small numberof people involved. : .din interesting observation wast € appearance the € serafifinar of the -cople‘beginning abeut Fielks APRpo. sure. By 6 months, this pigmentation had largely grown out with the nail and had disappeared in most cases. The cause of this phenomenonhas not been explained. Je