CHAPTER 17 dose is negligible. However, the data do not permit scaling or extrap- olation to other yields and burst conditions. No explicit method is given in current literature for calculating F.P.C. radiation doses at shielded locations aboard ship (although it would be possible to adapt the method of calculating transit radiation dose), and no field-test data exist to indicate the radiation doses that might be expected at such shielded locations. Results of tests made with radioactive isotopes to simulate the source of F.P.C. gamma radiation indicate that, at some locations, the protection afforded by a ship the size of a cruiser can reduce the free-field exposures by as much as a factor of 30. However, since the energy of F.P.C. gemma radiation is high, protection afforded by smaller ships (which are more lightly constructed), such as destroyers, would be less than that in- Gicated by the test results. Exposures of electronic equipment to F.P.C. radiation at field tests and to laboratory-simlated F.P.C. radiation indicate the sensitivity of such equipment to high-intensity short-duration pulses of such radiation. It was found that electronic equipment such as semiconductors and electronic fuze components are particularly vulnerable. In some cases, permanent damage occurred; in other cases, transient disturbances occurred that could cause malfunction of equipment ina 2 tactical situation. 17-33