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Plate
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Photo Description
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1 | (a)
- (d) — Fully developed uranium halos in mica (biotite)
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2 | (a) - (d) —
210Po halos in mica (biotite); (a) —
also with a 218Po halo
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3 | (a) - (d) —
214Po halos in mica (biotite)
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4 | (a) - (d) —
218Po halos in mica (biotite)
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5 | (a, b & d) — Elliptical (compressed)
210Po halos in coalified wood;
(c) — Dual 210Po halo in coalified wood
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6 | Uranium halos in fluorite in different stages of development:
(a) - (b) — Embryonic;
(c) - (d) — Fully developed;
(e) — Overexposed, first-stage
reversal; (f) - (g) —
Overexposed, second-stage reversal; (h) —
Overexposed, third-stage
reversal
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7 | (a) - (h) — 210Po halos in fluorite
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8 | (a) - (h) —
218Po halos in fluorite; (c) — center darkened
by electron microbeam analysis
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9 | (a) — 218Po halos in mica (biotite);
(b) — Spectacle halo
in biotite; (c) - (d) —
214Po halos in biotite
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10 | (a) — Overlapping 210Po halos in biotite, using phase contrast;
(b) and (d) — Thorium halo and
giant halo in Madagascan mica;
(c) — Dwarf halos in Ytterby mica;
(e) - (f) —
Assortment of different
polonium halo types in biotite; (g) — 214Po halos in biotite;
(h) — A 210Po and a 214Po halo in biotite
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11 | (a) — Biotite crystal from Murray Bay, Canada; (b) — Po halo
containing specimens of granite from New Hampshire, the dark areas are biotite crystals;
(c) — Zircon crystals extracted from granite drill cores taken from a depth of about
15,000 ft.; (d) — Rhyolite from 1,683.3 ft. (specimen obtained from
J. Eichelberger, Sandia National Labs)
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