Institut De Radioprotection Et De Surete Nucleaire

Etat Francais Represente Par Le Delegue General Pour L'armement

Denis Maro

Philippe Laguionie

Yves Baron

The invention relates to a collection device () that comprises a plurality of collection containers (A,B,C) suitable for receiving rainwater, each collection container (A.B,C) comprising a circumferential wall () and a lower wall (). The collection containers (A,B,C) are stacked so as to form a stack along a vertical axis (Z). Each container (A,B) arranged above another, adjacent container (B,C) comprises a water flow opening () that is provided in the lower wall () thereof and leads into said other, adjacent container (B,C). Each container (B,C) that is arranged below another, adjacent container (A,B) houses a buoyant closure element () that is movable along the vertical axis (Z) between a lower position and an upper position depending on the amount of water in said container (B,C) and closes the flow opening () in the upper position.

Device for sequentially collecting rainwater, in particular with a view to studying the variation in the radioactivity of rainwater

The invention relates to the measurement of the tritium concentration of the water vapor in air and more particularly the subject of the invention is a method of automatically sampling tritium in the water vapor of air using a cold trap, of the type comprising a first step of condensing the water vapor of the air by cooling over a cold trap and a second step of recovering the ice formed in the previous step in the form of condensation liquid, characterized in that the air is contained in a sampling chamber () and is brought into contact with a cold trap () which has been brought to a temperature below 0&#xb0; C. and in that the liquid of the second step is obtained by warming the cold trap.

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Cherbourg Octeville, France

Denis Maro