| 摘要 |
<p>1. Probe for measuring the degree of local vacuum of a two-phase emulsion (23), the said probe comprising - a tube (2) made of a metallic material capable of withstanding severe conditions of temperature and of pressure, this tube (2) being of small diameter, for example of the order of 5 mm, and comprising, near one of its ends (2a), a portion (7) pierced by a window (8) permitting the circulation of the two-phase emulsion, - a source (3) of low-energy gamma radiation, disposed within the tube (2), at the said end (2a), - an emission collimator (6), placed on one side of the window (8) and in such a manner as to collimate, in the direction of the said portion (7), the radiation emitted by the source (3), - a detection collimator (4), placed on the other side of the window (8) and provided to collimate the radiation emitted by the source (3) and having traversed the said portion (7), the emission collimator (6) and the detection collimator (4) being sealed against fluids, and - means (5) for detecting the radiation, which are disposed downstream of the detection collimator (4) and opposite the source (3) in relation to the window (8).</p> |
