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In accordance with column 2 of REACH Regulation (EC) No. 1907/2006, Annex VII, section 9.2.1.1, studies on biodegradation in general do not need to be conducted as cesium iodide is an inorganic compound. 
In addition, in accordance with column 2 of REACH Regulation (EC) No.1907/2006, Annex IX ,section 9.2.1.2, 9.2.1.4 tests on "biodegradation in water and sediment" do not need to be conducted as cesium iodide has a low log Pow. Neither direct nor indirect exposure is expected.

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Additional information