TABLE III.

Estimates of scattering-particle size (2â) and the scattering strength $(\overline{n}{\gamma }_0^2)$ are summarized below. The spherical shell form factor model [Eq. (19)] was used to calculate the results of column A, and that of Faran (Ref. ¹³ and Sec. I C) was used for column B.

				Results A		Results B
Sample	Nominal sphere diameter (microns)	Nominal $\overline{n}{\gamma }_0^2$ (mm−3)	Center frequency (ka)	Estimated sphere diameter 2â (µm)	Estimated $\overline{n}{\gamma }_0^2$ (mm−3)	Estimated sphere diameter 2â (µm)	Estimated $\overline{n}{\gamma }_0^2$ (mm−3)
	glass
1	40 ± 3	40	7.5 MHz(0.61)	40 ± 7	42	38	47
2	41 ± 2	66	7.5 MHz(0.61)	42 ± 8	78	37	120
3	41 ± 2	66	7.5 MHz(0.61)	49 ± 5	21	41	71
4	75 ± 3	8.2	5.0 MHz(0.76)	73 ± 32	…	73	…
5	85 ± 3	33	3.5 MHz(0.61)	102 ± 12	20	84	54
			5.0MHz(0.87)	87 ± 11	26	87	26
6	105 ± 4	4.1	5.0 MHz(1.07)	95 ± 9	5.2	105	2.1
7	120 ± 4	12	3.5 MHz(0.86)	111 ± 9	7.5	115	10
			5.0 MHz(1.22)	95 ± 8	13	113	8.2
8	175 ± 6	0.15	2.25 MHz(0.80)	169 ± 33	…	165	…
9	175 ± 6	0.73	2.25 MHz(0.80)	186 ± 30	…	170	…
10	polystyrene	0.93	2.25 MHz(0.37)	not applicable	not applicable	86	2.5
	81 ± 4		5.0 MHz(0.83)			83	6.6