meters was suspended by a wire fren e piece ef angle iron en the top of the cap. The shock front activated this group. A third set of dosineters was suspended frome mechanical 60-secend yhotographic timer. The timer was activated when the thermal refiation burned through a plece ef black nylon string. The instruments dropped approximately 1 minute after the detonation. In afdition, one set of dosineters remined fixed at the top of the statien and ancther at the botten. The dosimeters were affixed in this fashien to afford an opportunity to measure the rediation up to the tine of activation and then be dropped to the bottom of the pipe for shielding from residual radiation. Thus, the dosimeters integrated the dose received wp to the tine of arrival ef thermal anf chock pulses, the dose received up to 1 mimute, and total "* radiation. 2.2.8 Station Layout, Utilisation, and Construction. layout and utilisation are given in Table 2.3. ‘The station ‘The station construction is show in Table 2,4, since the ancumt of shielding surrounding the detector is of importance in the date analysis. | - Beries 210 stations consisted ef en 18-inch epen-did aluminas ©’ cylinder mounted 36 inches above the ground on a &-inch-diameter aluxinum rod. The dosimeters were retained by a bolt of each end ef the cylinder. Series M10, 211, 212, and 213 stations were eonstructed of steel Pipe capped at both ends. ‘The pipes were mounted vertically /n the ground with the exceptian of Series 212, where the pipes were mumted vertically in the center of a 6-foot eoncrete evbe, the surface ef which wes flush with the grount.