2 oat atte incidenwe in the exposcd Rongclap people than in the unexposed group and the low-level expased Utirik group. Whether ur not this is corcclated with radiation exposure cannot be ascertained, The data must be interpreted with considerable caution since (a4) the populations are small, (1d) the unex pased population was not examined before 6957 and has undergone changes due to buthat- trition and addition, (c) the diagnosis of malig- nancy is ned certain incall cases becuuse of the difficulty of obtaining autopsics for verification, and tal the types of malignancy were not those that have beeu correlated with radistion esposureinthe Japanese caposcd at Livoshinia and Nagasakit?? VI. Radiological Monitoring of Personnel and Environment A. GENERAL Figure 53. Steel roomused fur whole-bady gamma spectrascopy.? During their 3-vear sojourn on Majuro (1934- 1057), the Rongelap peaple’s body burdens of Figure 54. Arrangement of lead bricks used for whole-body counting. radionuclides decreased rapidly, as shown by Laboratory in Chicago. The finding of detect> able levels of /Cs and “An (higher inthe Utiriks) indicated the feasibility of using this technique in the lands, When the Rongelip people returned totheir home istand in b957, the lawlevels of en- Vironincotal contamination were soon reflected in tnereased body burdens of some radionuclides. A number of radiological surveys!)ac Rongelap and Uirik have been carried out in conjunction with peroonel monitoring. largely by Cniversity of Washington stuf sacl more recently also by a group from the BN1. Heath Physics and Safety Division. These studies have provided important infurmation on the movements of radionuchdes from the sat through the murine and plant food chain to man and should prove uscful in predicting Cature bady-buarden patterns of people renin. ing to Bikind and Eniwetok, The principal residual radioactive clements on Rongelip aod Utirik were ICs, Se,Znand ole, with small but measure able amounts of other fission products and neutron: 3 FR 2 Prirae + Rongelap and 2 Utirik people at Argonne National “ , there. fa 1057 Ch vears aficr the accident) gamma spectrograplic analyses were carried out on 4 7 * * jouw eet he we a posed toa very low levels of cosidual radioactivity ne i: ee a radiochemical analyses of urine, By G months radionuclides in the uring were barely detectalle.* Vhe Ctirik people were moved back to their home iMand after the initial cauminations and were ex. a Ae : Drsa Ws eee- iw .. \