Fig. 4.13¢ —- Photomicrographs of Engebi beach sand on ashing plates counted May 1953. (A) 4000 to
5000 c/m. Esumated using end-window survey meter, Fragments of a white hollow
sphere broken in handling. Total plate, 5500 c/m. Magnification, 23x. (B) 1400 c/m,
Three irregular particles, Total plate, 2100 c/m. Magnification, 23x. (C) 1900 c/m.
Central white sphere with protrusions, Total plate, 2200 c/m. Magnification, 23x. (D)
8000 c/m. Hottest particie encountered; sphere with protrusion, Total plate, 8600 c/m.
Magnification, 23x. ({E) 2000 c/m, irregular particle with heat-smoothed appearance.
Magnification, 23x,
Fig. 4.13d—- Photomicrographs of Engebi beach sand on ashing plates counted May 1953, (A) 7800
c/m, End view of mottled gray cylinder 1 mm long. Magnification, 23x. (B) 450 c/m.
Unsmoothed chalky fragment, Magnification, 23x, (C)6000 c/m. Particle with heatsmoothed appearance of upper surface. Magnification, 23x. (D) 1300 c/m. Mottled
irregular parucle, Magnification, 23 x. (E) 300 c/m. Eight particles, some of which,
from their appeavance, were suspected of being radioactive but gave no reading on endwindow survey meter, Magnification, 23x,
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