Appendix D ORIGINAL DATA This appendix contains all the original counting data used in the body of this report, since this information in unmodified form may be useful for studies not attempted by the project. For greater convenience, a limited amount of descriptive and analytical material has been included. D.1 LINEAR FREE-FIELD AND SHIPBOARD RECORDS A Unear presentation of the gamma records was used in the Interim Test Report (ITR-—1621). These records are preliminary uncorrected resuits plotted automatically by the GITOUT. Since ITR’s are destroyed after the final reports are issued, these original linear presentations are reproduced here. They may be helpful In indicating the relative importance of specific features of the total gamma record for quick tactical considerations. No particular attempt has been made to correct these records; therefore, they must be regarded as approximate. Not all records contained in the ITR are reproduced. The discussions in Section 3.3.2 and 3.4.1 are equally applicable to those records that do appear here. D.2 METER SURVEY DATA FOR CORACLES The coracles were surveyed with a Cutie-Pie (CP-3DM beta-gamma survey meter, Reference 103) shortly after recovery. For Wahoo, the meter probe was held 3 feet above the IC port roughly in the center of the coracle. Since the coracle background was so lowafter Um- brella, the meter probe was held 3 inches above the IC port. The survey meter data may be converted to approximate std-GITR response bythe factors 2.3 and 0.36 for Wahoo and Um- brella, respectively. The original and converted data is presented in Table D.1. A plot of this data versus distance from surface zero (Figure D.34) indicates that the general background for Wahoo was about a factor of 10 higher than that for Umbrella. D.3 IC COUNTING DATA AlL IC trays were counted on Shelf 5 in one of two end-window gamma counters described in Section 3.3.1. Counter 2 was used at the EPG, and Counter 1 was used at NRDL. The two counters were nearly identical, no conversion factor from one to the other being necessary. Upon recovery of the coracles in the field, all IC trays were immediately removed to a laboratory at the site where they were given a preliminary count with a MX-5 survey meter with its probe positioned exactly ¥, inch above the center of each IC tray. This reading was used to distinguish trays having significant radioactive deposits, so that maximum counting time could be assigned to trays having usable data and so that decay counts on the most active samples could be started immediately. After this initial count at EPG, all IC trays were returned to NRDL where a second count of all collections was made. Trays were shipped in individual plastic bags, which precluded cross-contamination during shipment. The tray counts for a complete set of IC trays (both exposed and unexposed trays in the case of IC collectors which jammed) were plotted, and a background for the entire set of trays was determined. These backgrounds for the tray set are reported as “collection bkgd (measured)” at the beginning of each table of original counts; backgrounds determined from the counts fora complete IC tray set and backgrounds calculated for other times using the standard decay curve 379 Aawrr