| US 7,361,907 B2 | ||
| Method for direct dosimetry of radioactive nuclei in different types of samples using solid-state detectors of nuclear traces | ||
| Abdeslam El Harti, Lot Gay Victor No 4 Rue Akrache, Souisi, Rabat (Morocco) | ||
| Assigned to Abdeslam El Harti, Rabat (Morocco); Khalid Maaouni, Rabat (Morocco); and ASD (Advanced Scientific Developments), Casablanca (Morocco) | ||
| Appl. No. 10/546,936 PCT Filed Feb. 12, 2004, PCT No. PCT/MA2004/000001 § 371(c)(1), (2), (4) Date Aug. 26, 2005, PCT Pub. No. WO2004/077095, PCT Pub. Date Sep. 10, 2004. |
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| Claims priority of application No. 27055 (MA), filed on Feb. 26, 2003. | ||
| Prior Publication US 2006/0192138 A1, Aug. 31, 2006 | ||
| Int. Cl. G01T 1/04 (2006.01) | ||
| U.S. Cl. 250—472.1 | 3 Claims |
| 1. A process for defining a probability of detection by a detector of traces of nuclear particles for nuclei of different
types, the process comprising:
identifying angles of incidence (θic), (θic1) and (θic2) of alpha particles of energy (Ei) emitted by the nucleus and reaching the detector;
detecting the angles of revelation of the detector;
determining a relation between the angle of incidence (θi) of the particles on the detector and the angle of revelation (θc) of the detector for values (h) characterizing an intersection between the angle of incidence of the particular on the detector
and the angle of revelation of the detector;
obtaining either zero intersections or two intersections for each of the values (h) and which correspond to a maximum energy
(Emax) and a minimum energy (Emin) that are detectable in oblique incidence of the particles for each of the values (h);
identifying and evaluating intersection surfaces {S(θic)∩S(R)} and {S(θic1,θic2)∩S(R) } representing respectively the intersection surfaces between the surface described by the angle (θic) on a plane of the detector and that of the detector at a radius (R) and the intersection surface between a surface described
by a ring limited by the angles (θic1) and (θic2) on the plane of the detector and that of the detector at the radius (R), a residual energy of the alpha particle of energy
Ei emitted by the nucleus at a height (h) of the plane of the detector is in an interval Emin≤Eind≧Emax such that particles are emitted under angles between (θic1) and (θic2) for which Eind>Emax, a proportion of the particles emitted by a nucleus located in a position of coordinates (r,h) and under angles of incidence
below a critical angle of incidence (θic) which reach the detector is a ratio between a surface defined by the surface S(θic) described by the angle (θic) on the plane of the detector and the surface S(θic) described by the angle (θic) on the plane of the detector defined by
 determining a function Pi(r,h) expressing the probability of detection by the detector of traces of nuclear particles for each type of nucleus emitting
the alpha particles of energy Ei for Emin≤Eind≤Emax in which
 in which
S(θic)=πRc2,Rc=h·tg(θic).
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