DNA 1240H-2 that, during a nuclear detonation, exposure to 10? nvt (neutrons/cm?), with negligible gamma radiation, can cause malfunction of semiconductor devices, and audio unite were severely damaged by exposure to 1. 1x ols nvt. Many industrial firms have been investigating the effects of pulsed miclear radiation on electronic equipment (as indicated in Ref. 39), particularly the temporary disablement of avionics controls in a weapon system, an effect that would jeopardize the success of the weapons’ mission. 17.4.6 Summary The F.P.C. radiation incident on a target within the first minute following a water-surface or shallow underwater burst includes neutron radiation, gamma radiation due to inelastic scattering and nitrogen capture of the prompt neutrons, and fissioneproduct gamma radiation. For surface bursts, the free-field F.P.C. neutron and gamma doses vs distance from surface zero for weapons of various fusion-to fission ratios can be estimated from Figs. 17-4, 17-5 and 17-6, For weapons of 1 MI or less, the gamma dose is negligible at distances of about 3,700 yards (11,000 ft) or more. For underwater bursts, the neutron dose may be disregarded. ‘The only available gamma data, from Shots Umbrella and Wahoo at Operation Hardtack, indicate that for underwater bursts of about 10 KT the gamma