e ai = na: a will have the skiffs that Dr. Isaacs mentioned. These will have total collectors on them, and time of arrival instruments. They'll also have an instrument for measuring intensity with depth, belonging to Scripps Institution. In the distance between 30 and 100 miles, we will be operating two ships (converted Liberty type) called the YAGs 39 and 40. Most of you are probably familiar with them as the "disappearing YAGs", On the nearest of these YAGs, (the one that is in the highest intensity fallout area), we will have what we call a "standard array" of instruments mounted, They will be up on the king-post to avoid spray and stack gases, The following instruments will be mounted on that: four open close collectors (to be opened just before fallout starts and closed just afterwards so that we can have undisturbed samples), two total collectors (these just simply collect everything), and an intensity time recorder which records gamra radiation. There will be an instrumental collector which collects fallout over pre-set timing areas. There will be an anemometer and that type of thing. We will have the whole platform shielded in order to avoid bias, These barges that I mentioned will have that array of instruments on them, and also both YAGs will have that array. Out 100 to 200 miles, we will have an LST operating, and this too will have a standard array of instruments, On the YAG 40, we will have a special instrumental collector that's designed to collect fallout and then, by a sort of dumb waiter system, to deliver this below deck to a shielded laboratory ‘that we will have on the YAG, There we hope to make some early time studies that we feel are very badly needed - the "K" measurements and gamma spectrum. With time and personnel permitting, we hope to make similiar measurements on Baker. This will be done during fallout and samples that are delivered to the laboratory, will be during this actual fallout. Also, on the YAG, we hope to be making measure- ments that will complement Scripps! measurements in regard to water sampling and oceanographic survey. We hope to make both surface measurements and also measurements of intensity with depth. We hope that certain of these measurements will also be applicable to the aerial survey, since they measure intensity of an altitude and this is a function of the activity in the surface layer. We hope to give them information on that surface layer along with Scripps in order to tie their information together. The ships, in general, will be directed to near their locations about H-12, and then we have to keep in touch with a central command group that we hope to have in a central location with the Task Group Command ship. On the basis of later wind data, we can direct the ships to their final locations. It can be very great, of course, maybe 30 miles or something like that. At that location, they will then maintain position until the completion of fallout, perhaps some period afterwards. What we are attempting to do here is that in checking model theory, of course, contour data is absolutely fundamental. We hope to provide the supplementary contour data in the lagoon for close distances. However, there is another possible approach too, This is if one can collect at some known point in the fallout pattern, it is a function then of particle diameter, if these points are chosen properly, in the fallout pattern, we feel that it is possible to distinguish gross differences in model theories. In other words, all the theories apply the same basic laws of motion as aerodynanics of small particles, and somehow come out with different answers. This, of course, is because of different assumptios. These assumptions may result in gross differences of patterns that we hope to be able to distinguish by these fine collection COPIED/po LANL Re : ae ae ae ps OCT Y e ee a