Table 4 Ratio of CsMP radioactivity to the total radioactivity of a mask containing CsMPs.

From: Radiocesium-bearing microparticles discovered on masks worn during indoor cleaning

Sample ID	Worn	Radioactivity of CsMP at the worn				Radioactivity of mask				¹³⁷Cs radioactivity ratio of CsMP/Mask(%)
Sample ID	Worn	¹³⁴Cs [Bq]	σ	¹³⁷Cs [Bq]	σ	¹³⁴Cs [Bq]	σ	¹³⁷Cs [Bq]	σ	¹³⁷Cs radioactivity ratio of CsMP/Mask(%)
Mask-001-A	2016/9/29	0.193	0.012	1.01	0.01	7.25	0.10	39.0	0.3	2.59
Mask-001-B	2016/9/29	0.0227	0.0128	0.0973	0.0050	7.25	0.10	39.0	0.3	0.250
Mask-012-A	2016/10/25	4.84	0.12	25.4	0.1	238	1	1420	3	1.79
Mask-012-B	2016/10/25	11.0	0.2	58.8	0.2	238	1	1420	3	4.14
Mask-012-C	2016/10/25	8.62	0.20	46.3	0.2	238	1	1420	3	3.26
Mask-015	2016/10/26	0.0763	0.0134	0.322	0.005	33.4	0.2	195	1	0.165
Mask-023	2016/10/26	0.0571	0.0165	0.345	0.006	10.1	0.1	57.2	0.4	0.603
Mask-037-A	2017/1/17	0.386	0.030	2.08	0.01	10.0	0.2	61.2	0.5	3.40
Mask-037-B	2017/1/17	0.185	0.020	1.12	0.01	10.0	0.2	61.2	0.5	1.82
Mask-045	2017/1/18	0.159	0.025	0.704	0.010	7.73	0.15	47.8	0.5	1.47
Mask-053	2017/1/24	0.0147	0.0091	0.126	0.004	11.7	0.2	70.1	0.6	0.180
Mask-058	2017/1/25	0.133	0.017	0.779	0.006	15.1	0.2	92.1	0.7	0.846
Mask-067	2017/4/20	0.0397	0.0189	0.276	0.009	4.63	0.12	30.7	0.4	0.900
Mask-083	2017/5/16	0.0762	0.0136	0.464	0.006	3.20	0.10	21.3	0.3	2.18
Mask-087-A	2017/5/17	0.0260	0.0095	0.146	0.004	9.25	0.16	65.9	0.6	0.222
Mask-087-B	2017/5/17	0.0751	0.0205	0.547	0.010	9.25	0.16	65.9	0.6	0.831
Mask-087-C	2017/5/17	LDL	–	0.0468	0.0020	9.25	0.16	65.9	0.6	0.071
Mask-087-D	2017/5/17	0.0299	0.0121	0.193	0.004	9.25	0.16	65.9	0.6	0.294
Mask-087-E	2017/5/17	0.0251	0.0095	0.119	0.004	9.25	0.16	65.9	0.6	0.181
Mask-087-F	2017/5/17	0.0326	0.0102	0.204	0.004	9.25	0.16	65.9	0.6	0.309
Mask-087-G	2017/5/17	LDL	–	0.0805	0.0023	9.25	0.16	65.9	0.6	0.122
Mask-090	2017/5/17	0.107	0.017	0.652	0.007	14.1	1.9	96.4	0.7	0.676
Mask-101	2017/5/25	0.0439	0.0133	0.352	0.005	1.55	0.08	10.5	0.2	3.35
Mask-114	2017/6/15	0.0248	0.0076	0.130	0.003	1.65	0.09	12.2	0.2	1.06
Mask-126	2017/7/11	0.116	0.019	0.681	0.009	18.8	0.2	131	1	0.520
Mask-127-A	2017/7/11	0.0964	0.0183	0.571	0.009	12.2	0.2	84.4	0.6	0.677
Mask-127-B	2017/7/11	0.0556	0.0109	0.353	0.005	12.2	0.2	84.4	0.6	0.418
Mask-127-C	2017/7/11	0.0529	0.0135	0.357	0.005	12.2	0.2	84.4	0.6	0.423
Mask-127-D	2017/7/11	0.0334	0.0119	0.261	0.005	12.2	0.2	84.4	0.6	0.309
Mask-127-E	2017/7/11	0.305	0.028	1.89	0.01	12.2	0.2	84.4	0.6	2.24
Mask-142	2017/8/29	0.0556	0.0155	0.465	0.007	3.08	0.11	24.2	0.3	1.92
Mask-197	2017/11/8	0.0575	0.0104	0.298	0.005	2.11	0.09	16.6	0.3	1.79
Mask-242-A	2018/5/30	0.177	0.021	1.71	0.01	1.37	0.05	12.9	0.2	13.2
Mask-242-B	2018/5/30	0.0699	0.0151	0.633	0.010	1.37	0.05	12.9	0.2	4.90
Mask-243-A	2018/5/30	0.0970	0.0121	0.850	0.008	4.15	0.07	39.3	0.3	2.16
Mask-243-B	2018/5/30	0.0343	0.0074	0.352	0.005	4.15	0.07	39.3	0.3	0.897
Mask-243-C	2018/5/30	0.0552	0.0133	0.441	0.009	4.15	0.07	39.3	0.3	1.12
Mask-246	2018/7/9	0.0184	0.0067	0.193	0.004	0.871	0.072	8.34	0.21	2.31
Mask-253	2018/9/26	0.0421	0.0082	0.384	0.006	1.03	0.07	8.87	0.21	4.32
Mask-256	2018/9/26	0.0645	0.0132	0.661	0.010	0.880	0.036	8.69	0.13	7.60
Mask-275	2018/11/30	0.0245	0.0070	0.246	0.005	1.30	0.11	14.1	0.3	1.75
Mask-276	2018/11/30	0.0164	0.0057	0.132	0.004	2.18	0.05	24.3	0.2	0.543
Mask-282	2019/1/23	0.0377	0.0082	0.421	0.005	5.72	0.18	60.2	0.5	0.700
Mask-283	2019/1/24	0.0570	0.0098	0.649	0.006	3.41	0.19	34.4	0.4	1.89
Mask-284-A	2019/1/24	0.0591	0.0111	0.636	0.009	17.9	0.3	196	1	0.324
Mask-284-B	2019/1/24	0.0101	0.0059	0.168	0.004	17.9	0.3	196	1	0.0859
Mask-284-C	2019/1/24	0.0253	0.0052	0.246	0.004	17.9	0.3	196	1	0.126
Mask-284-D	2019/1/24	LDL	–	0.0142	0.0015	17.9	0.3	196	1	0.00723

LDL: Lower the detection limit.

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Table 4 Ratio of CsMP radioactivity to the total radioactivity of a mask containing CsMPs.

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