6 ar CHGRETORESELSe 0018933 dose was continuing to rise at the rate of 50 mr. /min, and the radiological advisor aboard decided to disontinue the mission and return to base. The standby aircraft took off and was flown toa point on a bearing of 330 degrees ata distance of 120 miles from surface zero. AH #/ 8 hours the aircraft searched on course 225 degrees, but no fallout was encountered, At H # 10 hours the active fallout area was reentered at bearing 283 degrees, 140 miles from surface zero, 2nd a sample taken. At H / 13 hours a third sample was collected at bearing 278 degrees, 150 miles from surface zero, eT 2.3.4 Oak Event. There was no rocket participation during Shot Oak. Circumstances leading to the discontinustion of the rocket sampling portion of the project are outlined in Section 2,3.5 and Appendix A. a 5 samples were taken from the cloud by B-57D aircraft between 2 and 26 hours post shot time (see Tables BS & B6). Both the wing tank and coincident samplers were operative on all flights, A WB-50 aircraft collected samples from the northeastern edge of the fallout pattern at 4, 6, 8, 10 and 1]-1/2 hours after the detonation, The fallout was encountered ona bearing of 300-310 degrees at 65, 93, 125, 160 and 187 miles from surface zero, The operation pregressed without incident, due mainly to the experience gained by the participating personnel