(a) Shots of detonations from various angles, From the point of visual impact, magnitude of detonation as seen on the screen is a function of camera distance as well as shot yield, Therefore a great need is for detonation shots that provide a proper frame of reference. For example, if a multimegaton shot at Bikini could be photographed from Eniwetok and the distance given in general terms, 1.e,, "180 miles,” the motion picture would give a much better idea of order of magnitude, Civil Defense could then relate the distance to well known distances between cities, A human figure, and perhaps palms, in the foreground of such a shot would lend further meaning. For shots closer to the point of burst, a ship of recogniz- able size in the foregrdund would have a similar effect, In general, relating the shot to known distances would allow super-imposition of animated effects later in order to obtain maximum understanding of the scope of effects, Similarly, relating automatic camera coverage to known distances would be of great value, The declassification ditficulties inherent in such a proposal are recognized, ard it should be made clear that FCDA does not require a high order of precision in distance relationships, Order of magnitude figures gencrally are adequate for Civil Delense purposes, \b) Effects of blast and thermal radiation, These are difficult to picture adequately under circumstances of an Eniwetok Test Site Operation, However, the following suggestions may be helpful, On the advice of the Test Director's organization, it may be possible to select positions and structures where effects will be visible, Before and after shots may be planned for such positions, Such shots would be more useful if related to distances, As an example, damage to installations on various islands from CASTLE BRAVO would have provided good before and after pictures to demonstrate the effects of blast, It would also be of considerable value if pictorial differentiation between shock and drag targets were possible. Such pictures may possibly be obtained in cooperation with military effects programs, Similarly, any picturization of duration of thermal radiation would be of major assistance in illustrating propagation of this effect by large weapons, although it is difficult to imagine how such pictures could be taken except through the use of automatic cameras, Effects of fallout. I+ is assumed that fallout collecting devices will be used in substantial quantity and that before and after pictures of the devices will be available, Picturization of macroscopic fallout particles could be used in a way that would not be misleading. Pictures iliustrating prediction techniques, with predicted patterns related to actual patterns would be of great value, In addition, FCDA wishes to stress the need for radiological defense monitoring, Pictures emphasizing that fallout measurements must be made, both by automatic recording stations and monitor personnel in aircraft and surface vessels, would be of use, Coverage of personnel protection activities would pose no particular problems, Ease of decontamination should be stressed, where decontamination -~ 3 -