\ interfere with normal spectra. known, fission product Their presence, especially \ radioiodine if it is not prevents accurate quantitation of the radio- iodine isotopes. There is a general policy of announcing all events that are detected on lL the ground off-site. bho / a and was not announced was the Drill Event of December L ct R. AN To date the only event that was detected off-site 5, 1964, 1315 PST. The circumstances surrounding the status of this event are unusual. a pi” v -| RG i, \ 42 The i opt Ho Crepe Event was conducted without incident on the same day and it, ~ ve rather than the Drill Event, was announced. tym yh te - wg OT 4 r Tr +4~Following is a summary of the monitoring and surveillance results for + = the Drill Event (yield 2.7 Kt): Ground Monitoring: 1. Peak - 0.2 mR/hr at 1830 PST, 5 miles east of Lathrop Wells, Nevada, on Highway 95. 2. The only measured exposure rate above background by a routine station recorder (RM-11) was less than 0.1 mR/hr DOE ARCHIVES at 1717 PST at Lathrop Wells, Nevada. 3. Radiociodine was not detected in milk or water samples. ne 6