Meteorological 1. Wind velecities in the lowest levels shall be persistent in direction with time to permit reliable predicticns for at least 2 hows just prior to the test. Vertical wind shear in direction and velocity is desirable provided the trajectory of the entire cloud mass is confined to a secter which contains minimal population witnin a radius of 50 miles. Radiological Safety a The external dose to non-participating inhabitants, of radiation from gamma rays, shall not excced the accepted interna- tional permissible dose level of 300 mr/wk, which may be integrate OVEr a maximum of 10 wecks. ee At a point of human habitation, the activity of radioactive Be The 2h-hour average radioactivit; per cubic meter of air, due to suspended particles havine diameters in the range O micron to 5,0 microns, shall not exceed 1/100 of tie above; nor is it desirable that any individual particle in this size range have an activity creater than 10-2 microcuries calculated } hours after the blast. particles in the atmosphere, averaged over a period of 2) hours, shall be Limited to 100 micrucuries per cubic meter of air (corresponding approximately to 4 ground level gamma intensity of 30 mr/hr). Radiological Test Data to be Chtained 1. Gross observations on the clouds a. b. on the surface: follow the cloud in detail up to 50 miles, taking data on wind, height of cloud, diameter, dissipation, local variations duv to wind currents, etc. in the airs follow the general contour of the cloud until level of twice backgrcund is reached. will be worked out with AFOAT-1). (Details Measurement of external radiction at ground level during passage of the cloud, along trajectory of the cloud. Ratio of beta to gamma activity at various points and times along the trajectory and at places of appreciable fall-out, Detailed plot of fall-out, from rim of crater through ereas showing approximately twice background intensity.