Table 3.

Concentration reference curve data

Concentration (particles  cm−3)	Scan 1	Scan 2	Scan 3	Scan 4	Average	% Standard error
2.5×1013	2042	2635			2339±296.5	12.7
6.25×1012	594	606	649	570	605±16.54	2.7
3.13×1012	266	291	257	214	257±16.04	6.2
7.81×1011	27	38	35	35	34±2.39	7.0
33.91×1011	10	17	16	17	15±1.68	11.2
1.95×1011	4	4	8	7	6±1.04	17.3
9.77×1010	1	3	1		2±0.71	35.5
4.88×1010	2	0	1		1±0.58	58.0
2.44×1010	0	0	1		0.33±0.41	124.0