samples collected was adequate for assay and separation, showing much improvement in this respect over the snap-sample volum. 363 - PHYSICAL ANALYSIS OF PARTICULATE DEBRIS 3.3.1 FPatrographic Analyses. Petrographic studies were made of individual radioactive debris particles collected from each of the six shots of the Castle series. For these tests the major constituents of the carrier material fall roughly into three groups as shown in Table 3-24. Further details as to refractive index studies and observations detailing the size, color and shapes of the individual particles observed can be found in Reference 12. 3.3.2 Specific Beta-Activity Measurements. Table 3.25 lists the modal specific beta activity determined for each of the Castle detonations. The modal values are only very roughly known, since the observed frequency distributions covered a broad spectrum of specific activities with no pro- nounced peaks (for further details, see Reference 13). 3.3.3 Gross Activity Measurements. Beta and alpha measuremants were made by Tracerlab, Inc. on gross samples from each of the Castle detona- tions. These measurements together with estimates of the Pu/Qf ratio are presented in Table 3.26. 36