| 摘要 |
A system of detection and monitoring of radioactivity caused by radionuclides at the gaseous state contained in a flow of fluid (107), comprising: a measurement chamber (127) comprising detector means (129) sensitive to the radiations emitted by the radionuclides, and feed means (103, 113, 115a, 115b, 121, 123, 125) for taking from said flow of fluid a fluid flow portion to be submitted to measure, and to feed it to the measurement chamber. The feed means are adapted to raise the pressure of the fluid flow portion to be submitted to measure with respect to an initial pressure (e.g., the atmospheric pressure) of the picked-up fluid, and to feed the fluid flow portion at raised pressure to the measurement chamber. Such pressure increase allows to have - in the same volume - a higher mass of sampled fluid to be exposed to the detector, resulting in an increase of sensitivity practically proportional to the ratio p/p0 (where p is the actual pressure in the chamber, and p0 is the atmospheric pressure. |
