the cloud transit, was not measured on any of the native atolls, but was observed following ROMEO during light secondary fall-out at BIKINI. _ (e} Although the deposition of radioactive matter on native atolls from each shot subsequent to BR.VO was relatively insignificant, contimuous additions of small amounts of contamination can eventually build up an appreciable background of long-lived fission products, This conceivably could result in prohibitive levels causing cessation of testing or permanent removal of native inhabitants. (f) Provision should be made on future operations to nessure the effects of radiation "shine" on at least the inhabited northern Mershall Islands .tolls. «jlso, to recordthe total dose for the operation, or fora particular event, a representative mumber of film badges should be cached, or worn by responsible personnel on these atolls, In order to maintain stande ard conditions of dosimetry, task force film badges ami task force processing of the badges should be used, (g) In order to avoid delay in determining the occurrence of fall-out on native atolls, and to implement paragraph 4.d(1)(f) above, manned monitor stations should be maintained on at least the northern Marshall Islands ‘tolls. These monitors should be equipped with two-way radic commini~ cations facilities, preferably of the CW-type for reliability and low power requirements, 7 (2) Cloud trajectories end interference with air routes: Definitive data on this subject were passed to CINCP.CFLT in terms of specific recommendations against closure of routes or to close a specified route for a specified pericd of time. Forecast trajectories were given in ters=s of the geographical coordinates of the 24, 48 amd 72-hour forecast positions av ee 31