Rapid Determination of Gross Alpha/Beta Activity in Water Based on Reverse Osmosis Membrane Enrichment Pretreatment

Table 1

Results of gross alpha/beta radioactivity in standard solutions by reverse osmosis membrane method.

Volume (L)	Gross α				Gross β				Enrichment time (h)
	Real value (Bq)	Measured value (Bq) (k = 2)	Recovery rate (%)	Relative uncertainty (%)	Real value (Bq)	Measured value (Bq) (k = 2)	Recovery rate (%)	Relative uncertainty (%)
0.1	0.14	0.12 ± 0.038	87.2	15.7	0.15	0.12 ± 0.056	80.0	23.3	0.5
0.25	0.35	0.33 ± 0.064	94.2	9.7	0.40	0.35 ± 0.110	87.6	15.7	1
0.5	0.72	0.68 ± 0.129	94.4	9.5	0.83	0.76 ± 0.170	92.1	11.2	2
1	1.41	1.33 ± 0.231	94.2	8.7	1.61	1.50 ± 0.297	93.4	9.9	6
1.5	2.10	1.92 ± 0.438	91.5	11.4	2.45	2.43 ± 0.257	99.0	5.3	11
2	2.86	2.61 ± 0.376	99.1	7.2	3.22	3.33 ± 0.446	103.4	6.7	17
2.5	3.48	3.58 ± 0.566	102.8	7.9	4.07	3.91 ± 0.563	96.1	7.2	25
3	4.22	4.05 ± 0.680	96.2	8.4	4.89	4.64 ± 0.780	94.9	8.4	36
Average value	—	—	95.0	9.8	—	—	93.6	11.0	—