CHAPTER 2 PROCEDUBS 2.1 GENERAL (U) The gamma data were taken directly from weapon test (WT) repor us for each operation. Actually the reported gamma dose data are not stri etwe ly initial gamma data but reoresent gamma doses received up to the tim: or tex detonation. recovery of the detectors, often hours after R ecert inrovations have greatly reduced the exposure time of the ganrs. detectors, but during the earlier operations the gamma detector in the field for lengthy and often unreported times. Most of $ were exrosed upwind of the detonation to minimize the fallout : oution, Table 2.1 gives the recommended ranges of most of the d ers. (Lb oo rl (U) Dosimeter films were the major gama--measuring system used at weapon tests. Films seem to be sensitive to every variable known to mankind, and they may be sensitive to some not known, Use of film as gamma dosimeter for controlled laboratory. experiments preserts some di culties in interpreting the data; but use of film at weacon tests, where little control is maintained and “where the quality and type of radiation are unusual, presents extreme difficulties. The NBS and aluminum-ood (AW) film badges have minimized but not eliminated energy, dependenc the films. Minimization of the field variables has progressed fron to test so that now it is believed that the gamma dose can be inter to within 25-35 percent. (U) Direct line of sight to the detonation point was a gamma, and neutron data. Where the gamma data overlaoped ‘ of two films, an educated guess was made as to which film was the original data were specified. Since the protective shield a number of assumptions concernin thickness, and composition had to be made in some cases. Factor direct neutron interaction with film were determined only for film py OO be be ' always adequately described, in the NBS holder. These interaction factors were assumed to be ap cable also to the AW LASL film holder. Very limited experimental d indicate that the above assumption is reasonable, at least for thern neutrons. Finally, the neutron-interaction factors obtained for the newer films were assumed to be applicable to the obsolete films of the same dose range. 20