are indicated; these are reported as “collection bkgd (calculated).” A plot of collection background versus distance from surface zero (Figure D.33) is similar to that for the Survey meter data (Figure D.34). Again the general background for Wahoo appears to be about a factor of 10 higher than Umbrella. These collection backgrounds were subtracted from all IC data used in the body of this report. It should be reiterated that the IC was designed to assess deposited material under conditions of heavy deposition originally expected from these underwater detona- tions. Under the conditions of light deposition, occasionally coupled with high transport veloc- ities, the 1C data suffers both from an appreciable collection bias and from Statistical variation between samples. Unmodified Wahoo tray counts are presented in Tables D.2 through D.12 and unmodified Umbrella tray counts in Tables D.13 through D.27. Complete data for the first 15 minutes of collection is presented; after this time, only collections significantly above collection background are reported. The IC collections are designated by the location of the collection followed by a time indicating the time at which the 1-minute collection ceased. The abbreviation “cont” following the time designator indicates that the IC stuck at the tray in question; therefore, the tray was exposed continuously from 1 minute prior to the indicated time until the coracle was recovered. When the time designator is Included in parenthesis, the tray was never actually exposed but was intended to be exposed at that time. Since the top tray was exposed from 1 min- ute prior to the shot to approximately zero time, it is frequently omitted from plots of IC collections; counting data for omitted trays is, however, included. by an X or, if more than one, by a series of X's. Omitted trays are designated D.4 IC DECAY DATA The counting procedure and method of designating IC collections are described in Section D.2. In most cases, the most radioactive tray was returned to NRDL for a decay count, while the second most radioactive tray was retained at the EPG for a decay count. In a few instances, a decay started at the EPG was continued at NRDL, thus affording two points on a decay curve. Decay data for Wahoois presented in Tables D.28 through D.44 and those for Umbrella in Tables Slopes determined on the basis of two points are presented in Table D.61 for trays not decayed but counted once at the EPG and once at NRDL. Pages 381 through 394 were deleted. \ 380 — aN D.45 through D.60.