Abstract: A ventilation unit includes a casing which has two openings and an electric connection passage, a filter cartridge, a turbine disposed inside the casing and having an input and an output and a motor, a duct linking the output to the outside area of the casing via the output, another casing with a passage created inside the wall, a control circuit and a source disposed inside the casing, elements for associating the two housings such that the passages form a single passage, a flow meter inside the duct. The control circuit includes an exit which can issue a first alarm signal when the electric energy value of the source falls below a threshold. The ventilation unit is suitable for the ventilation of nuclear protection suits, bacteriological protection suits or protective suits in hospital environments.

Abstract: A safe ventilated breathing apparatus to be worn by people in an ambient medium where there is an atmosphere at a pressure Pa that is substantially constant. The breathing apparatus includes a covering constituted by a skin of leakproof material, a fluid feed tube having one end suitable for being connected to a source of fluid at a given pressure Pn greater than Pa, and having its other end passing through the skin via a leaktight passage so as to plunge into the covering, vent elements made in the skin to put the inside of the covering into communication with the ambient medium, and elements for visually warning the person when the pressure of the fluid in the feed tube drops below a given threshold value Ps, less than Pn. The invention is particularly applicable to safe ventilated breathing apparatuses for the nuclear, bacteriological, etc., fields, hospital environments, etc.

Abstract: A ventilation unit includes a casing which has two openings and an electric connection passage, a filter cartridge, a turbine disposed inside the casing and having an input and an output and a motor, a duct linking the output to the outside area of the casing via the output, another casing with a passage created inside the wall, a control circuit and a source disposed inside the casing, elements for associating the two housings such that the passages form a single passage, a flow meter inside the duct. The control circuit includes an exit which can issue a first alarm signal when the electric energy value of the source falls below a threshold. The ventilation unit is suitable for the ventilation of nuclear protection suits, bacteriological protection suits or protective suits in hospital environments.

Abstract: A person intervening on the site is fitted with a plurality of radioactivity meters (1, 2, 3, 4, 11, 12) distributed over the body at locations such that at least two meters receive radiation doses that are different due essentially to the screen constituted by the body of the intervener, and the radiation doses received simultaneously by the meters are compared to deduce therefrom information concerning the direction towards the source relative to the intervener.