NED-NTUA: Fukushima Accident

Atmospheric concentration of fission products due to the Fukushima accident - Zografou Campus

Α/Α	Sampling Time		Concentration (µBq m^-3)
Α/Α	From	To	¹³¹I	¹³⁷Cs	¹³⁴Cs
1	23-3-11 / 09:45	23-3-11 / 15:54	Not detectable	Not detectable	Not detectable
2	24-3-11 / 08:30	24-3-11 / 14:30	100	Not detectable	Not detectable
3	25-3-11 / 08:39	25-3-11 / 14:20	100	Not detectable	Not detectable
4	25-3-11 / 14:25	25-3-11 / 20:31	130	Not detectable	Not detectable
5	25-3-11 / 20:36	26-3-11 / 08:30	124	Not detectable	Not detectable
6	26-3-11 / 10:33	26-3-11 / 17:00	175	Not detectable	Not detectable
7	26-3-11 / 18:04	27-3-11 / 09:00	233	Not detectable	Not detectable
8	27-3-11 / 09:05	27-3-11 / 19:09	246	116	103
9	27-3-11 / 19:32	28-3-11 / 07:32	85	Not detectable	Not detectable
10	28-3-11 / 09:35	28-3-11 / 17:18	114	Not detectable	Not detectable
11	28-3-11 / 19:15	29-3-11 / 07:15	75	30	32
12	29-3-11 / 09:30	29-3-11 / 17:12	169	Not detectable	Not detectable
13	29-3-11 / 19:15	30-3-11 / 07:15	252	Not detectable	Not detectable
14	30-3-11 / 09:05	30-3-11 / 17:20	335	Not detectable	Not detectable
15	30-3-11 / 19:20	31-3-11 / 07:36	201	Not detectable	Not detectable
16	31-3-11 / 08:45	31-3-11 / 17:16	347	Not detectable	Not detectable
17	31-3-11 / 19:09	01-4-11 / 07:09	444	Not detectable	Not detectable
18	01-4-11 / 18:50	02-4-11 / 06:49	77	Not detectable	Not detectable
19	02-4-11 / 10:48	03-4-11 / 22:48	156	Not detectable	Not detectable
20	03-4-11 / 16:35	04-4-11 / 04:35	359	40	43
21	04-4-11 / 17:40	05-4-11 / 05:40	622	158	157
22	05-4-11 / 15:20	06-4-11 / 03:20	555	240	192
23	06-4-11 / 18:35	07-4-11 / 06:35	392	67	63
24	07-4-11 / 18:13	08-4-11 / 06:13	493	30	30
25	08-4-11 / 18:12	09-4-11 / 06:12	224	35	Not detectable
26	09-4-11 / 20:00	10-4-11 / 08:00	137	Not detectable	Not detectable
27	10-4-11 / 15:23	11-4-11 / 03:23	225	Not detectable	Not detectable
28	11-4-11 / 17:50	12-4-11 / 05:53	196	26	Not detectable
29	12-4-11 / 15:30	13-4-11 / 03:30	162	31	Not detectable
30	13-4-11 / 17:08	14-4-11 / 05:08	88	Not detectable	Not detectable
31	14-4-11 / 19:30	15-4-11 / 07:30	54	Not detectable	Not detectable
32	15-4-11 / 16:45	16-4-11 / 04:45	45	Not detectable	Not detectable
33	16-4-11 / 17:23	17-4-11 / 13:52	49	Not detectable	Not detectable
34	17-4-11 / 13:40	18-4-11 / 03:40	23	Not detectable	Not detectable
35	18-4-11 / 17:09	19-4-11 / 05:09	15	Not detectable	Not detectable
36	19-4-11 / 17:00	20-4-11 / 05:00	52	Not detectable	Not detectable
37	20-4-11 / 18:40	21-4-11 / 06:40	53	Not detectable	Not detectable
38	27-4-11 / 18:50	28-4-11 / 06:50	Not detectable	Not detectable	Not detectable
Uncertainty:			20	20	20

Sampling and Analysis Data

Air Sampler: DH-5018E, F&J Specialty Products, Inc.
Sampling Rate: ~80 m³ h^-1
Detection System: Compton-suppressed XtRa Ge (rel. eff 104%), Canberra Industries Inc.
Analysis Software: SPUNAL, developed by NED-NTUA.

Lower Limit of Detection

Calculation of the Lower Limit of Detection is performed accordint to Gilmore G, et al, Practical Gamma Ray Spectrometry § 5.6. LLD values depend on sampling and analysis times and vary indicatively as follows:

Samplint Time (h)	Analysis Time (h)	Lower Limit of Detection (µBq m^-3)
Samplint Time (h)	Analysis Time (h)	¹³¹I	¹³⁷Cs	¹³⁴Cs
6	6	75	87	165
6	12	48	58	106
12	24	14	14	27