Coal, fly ash, slag, and combustion gases from a large cyclone-fed power plant 870 MW(e) were analyzed for a suite of elements. Mass balance calculations show that the sampling and analyses were generally adequate to describe the flows of these elements through the plant. Most Hg, some Se, and probably most Cl and Br were discharged to the atmosphere as gases.

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The neutron activation cross sections near 25 kev have been measured for about 50 nuclei. Gamma-ray scintillation spectrometers with known efficiency were used to compare the radioactivities produced by the several nuclei with I 128 . This gave a significant increase in sensitivity and precision over direct beta-counting methods in many cases. Absolute standardization was obtained through scintillation-beta-counting the I 128 in Nal(Tl) crystals irradiated with a neutron source calibrated by the manganese bath technique.

PARTICLEBINDING ENERGIES 1415 contraction of the region of diffuseness, the independentparticle model levels will separate. This is as experimental observations suggest. Such a coupling is analogous to that which occurs in the Bohr collective model of the nucleus through the intermediary of aspherical surface distortions. 15 If one wishes to compare the diffuseness parameters arrived at here with the diffuseness corresponding to other shapes, the 0.9 to 0.1 fall-off distance for a fixed distance to the 0.5 point might serve as a reasonable basis for comparison. Let us suppose, for a heavy element, that the distance to the 0.5 point is R=6.7 (in units of 10~1 3 cm). Then 6 = 0.2 corresponds to a fall-off distance of 2.6. This is only slightly more diffuse than the experimentally determined fall-off length (2.2) for the nuclear charge distribution in lead, 16 but appreci-15 A.

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