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March-April-May 2011 : Environmental monitoring results in the context of the Fukushima accident

The results for radioactivity in the air are as follows:

1. Real time radiation monitoring:

All the data measured in the environment to date have been normal.

2. Monitoring of samples taken from the environment for laboratory analysis:

	Filter paper air sampling ****	Activated carbon cartridge air sampling **	Rain water sampling
25/03/2011	Iodine 131 : 0,16 mBq/m³ Caesium 134 < LD* Caesium 137 < LD*	Iodine 131 < LD*	Sampling covering the period 21 au 28/03/2011 Iodine 131 : 1,3 Bq/l
26/03/2011	Iodine 131 : 0,28 mBq/m³ Caesium 134 : 0,051 mBq/m³ Caesium 137 : 0,016 mBq/m^{3 ***}	Iodine 131 < LD*
27/03/2011	Iodine 131 : 0,16 mBq/m³ Caesium 134 < LD* Caesium 137 < LD*	Iodine 131 < LD*
28/03/2011	Iodine 131 : 0,11 mBq/m³	Iodine 131 < LD*
29/03/2011	Iodine 131 : 0,15 mBq/m³ Caesium 134 < LD* Caesium 137 < LD	Iodine 131 :1,0 mBq/m³	Sampling covering the period 29/3/2011 to 4/04/2011 Iodine 131 : 0,59 Bq/l
30/03/2011	Iodine 131 : 0,47 mBq/m³ Caesium 134 < LD* Caesium 137 < LD	Iodine 131 :2,9 mBq/m³
31/03/2011	Iodine 131: 0,58 mBq/m³ Caesium 134 < LD* Caesium 137 < LD	Iodine 131 :2,9 mBq/m³
1/04/2011	Iodine 131: 0,27 mBq/m³ Caesium 134 < LD* Caesium 137 < LD	Iodine 131:1,1 mBq/m³
2/04/2011	Iodine 131 : 0,27 mBq/m³ Caesium 134 : 0,057 mBq/m³ Caesium 137 : 0,036 mBq/m^{3 ***}	Iodine 131:1,1 mBq/m³
3/04/2011	Iodine 131: 0,22 mBq/m³ Caesium 134 : 0,035 mBq/m³ Caesium 137 : 0,06 mBq/m^{3 ***}	Iodine 131 : 0,98 mBq/m³
4/04/2011	Iodine 131: 0,18 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 : 0,98 mBq/m³
5/04/2011	Iodine 131: 0,34 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
6/04/2011	Iodine 131 : 0,35 mBq/m³ Caesium 134 : 0,039 mBq/m³ Caesium 137 : 0,030 mBq/m^{3 ***}	Iodine 131 < LD
7/04/2011	Iodine 131 : 0,20 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
8/04/2011	Iodine 131 : 0,14 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
9/04/2011	Iodine 131 : 0,049 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
10/04/2011	Iodine 131 : 0,093 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
11/04/2011	Iodine 131 : 0,067 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
12/04/2011	Iodine 131 : 0,12 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
13/04/2011	Iodine 131 : 0,11 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
14/04/2011	Iodine 131 : 0,12 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
15/04/2011	Iodine 131 : 0,11 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
16/04/2011	Iodine 131 : 0,12 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
17/04/2011	Iodine 131 : 0,086 mBq/m³ Caesium 134 < LD Caesium 137 < LD	Iodine 131 < LD
18/04/2011	Iodine 131 : 0,019 mBq/m^{3 ****} Caesium 134 : 0,0062 mBq/m³ Caesium 137 : 0,0078 mBq/m³	Iodine 131 < LD
19/04/2011	Iodine 131 : 0,019 mBq/m^{3 ****} Caesium 134 : 0,0062 mBq/m³ Caesium 137 : 0,0078 mBq/m³	Iodine 131 < LD
20/04/2011	Iodine 131 : 0,019 mBq/m^{3 ****} Caesium 134 : 0,0062 mBq/m³ Caesium 137 : 0,0078 mBq/m³	Iodine 131 < LD
21/04/2011	Iodine 131 : 0,019 mBq/m^{3 ****} Caesium 134 : 0,0062 mBq/m³ Caesium 137 : 0,0078 mBq/m³	Iodine 131 < LD
22/04/2011	Iodine 131 : 0,019 mBq/m³ Caesium 134 : 0,0062 mBq/m³ Caesium 137 : 0,0078 mBq/m³	Iodine 131 < LD
23/04/2011	Iodine 131 : 0,019 mBq/m^{3 ****} Caesium 134 : 0,0062 mBq/m³ Caesium 137 : 0,0078 mBq/m³	Iodine 131 < LD
24/04/2011	Iodine 131 : 0,019 mBq/m^{3 ****} Caesium 134 : 0,0062 mBq/m³ Caesium 137 : 0,0078 mBq/m³	Iodine 131 < LD
25/04/2011	Iodine 131 : 0,0039 mBq/m^{3 ****} Caesium 134 : 0,0015 mBq/m³ Caesium 137 : 0,0021 mBq/m³
26/04/2011	Iodine 131 : 0,0039 mBq/m^{3 ****} Caesium 134 : 0,0015 mBq/m³ Caesium 137 : 0,0021 mBq/m³
27/04/2011	Iodine 131 : 0,0039 mBq/m^{3 ****} Caesium 134 : 0,0015 mBq/m³ Caesium 137 : 0,0021 mBq/m³
28/04/2011	Iodine 131 : 0,0039 mBq/m^{3 ****} Caesium 134 : 0,0015 mBq/m³ Caesium 137 : 0,0021 mBq/m³
29/04/2011	Iodine 131 : 0,0039 mBq/m^{3 ****} Caesium 134 : 0,0015 mBq/m³ Caesium 137 : 0,0021 mBq/m³
30/04/2011	Iodine 131 : 0,0039 mBq/m^{3 ****} Caesium 134 : 0,0015 mBq/m³ Caesium 137 : 0,0021 mBq/m³
01/05/2011	Iodine 131 : 0,0039 mBq/m^{3 ****} Caesium 134 : 0,0015 mBq/m³ Caesium 137 : 0,0021 mBq/m³

* LD : Limit of detection.

** Activated carbon cartridges are used to trap any iodine in gaseous form (gaseous iodine is not retained by the paper filters). As cartridges sample a lower volume of air in 24 hours than paper filters, they have a higher detection limit.

*** In order to optimise detection, this value for Caesium 137 is obtained by simultaneously measuring the 4 filters in the 4 Grenoble field stations.

**** As of 18 April 2011 the figures correspond to average weekly data.

For more information on environmental monitoring in France see the IRSN website.

The Institut Laue-Langevin runs 4 environmental monitoring field stations and a specialised laboratory. Each of the outstations are equipped with 3 types of instrument taking measurements in real time of:

Ambient dose rates
Volume activity of the air in gas
Volume activity of the air in aerosols (solid particles)

The outstations are also equipped with other air sampling devices which our technicians regularly remove for more detailed analysis in the laboratory; these include paper filters to analyse aerosols, active carbon cartridges to analyse halogens, and a bubbling system for tritium detection. The laboratory also takes field samples at regular intervals from the environment surrounding the Institute. [Further information.]

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Reactor, Environment & Safety

Environmental monitoring

March-April-May 2011 : Environmental monitoring results in the context of the Fukushima accident

* LD : Limit of detection.

** Activated carbon cartridges are used to trap any iodine in gaseous form (gaseous iodine is not retained by the paper filters). As cartridges sample a lower volume of air in 24 hours than paper filters, they have a higher detection limit.

*** In order to optimise detection, this value for Caesium 137 is obtained by simultaneously measuring the 4 filters in the 4 Grenoble field stations.

**** As of 18 April 2011 the figures correspond to average weekly data.