A graph of the width parameter σ versus energy for our high-resolution gamma detector.
A graph of the counts-to-yield ratio C/Y vs. energy for 232Th using a lantern mantle as the sample. For gamma energies above 200 keV the data follows a power law, indicated by the dashed line.
A graph of C/Y vs. for a soil sample. The thorium series radiation is plotted with solid circles and the uranium series with solid squares. The C/Y value for the peak at 186 keV, which contains both 238U and 235U series gammas, is plotted as an open triangle. The 1460 keV 40K radiation is plotted as an open circle.
A graph of C/Y vs. for “young” Brazil nuts. The radiation from 228Ac, before 228Th, is plotted as solid circles. The radiation from after 228Th is plotted as solid squares.
A graph of C/Y vs. for “old” Brazil nuts. The radiation from 228Ac, before 228Th, is plotted as solid circles. The radiation from after 228Th is plotted as solid squares.
A graph of counts vs. energy for the x-ray region of Brazil nuts. The photopeak at 32 keV is due to x-ray fluorescence of barium.
A graph of C/Y vs. for the uranium series. The solid squares are for the 238U series and the solid circles represent the 235U series.
The 232Th decay series.
The 238U decay series.
The 235U decay series.
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