초록 ▼

A method for detecting a radioactive source moving on a linear path substantially parallel to an alignment of N detectors. The method includes: forming N×Nt pulse counting values Mi,t (i=1, 2, . . . , N and t=1, 2, . . . , Nt) from N×Nt detection signals delivered by the N detectors in the form of a

A method for detecting a radioactive source moving on a linear path substantially parallel to an alignment of N detectors. The method includes: forming N×Nt pulse counting values Mi,t (i=1, 2, . . . , N and t=1, 2, . . . , Nt) from N×Nt detection signals delivered by the N detectors in the form of a succession over time of Nt sets of N signals simultaneously detected by the N detectors over a same duration Δt, a pulse counting value representing a number of pulses detected by a detector over a duration Δt; and computing, using a computer: a set of Nt correlation products Rt, a static mean R of the N×Nt counting values, a correlation condition for each correlation product Rt.

대표청구항 ▼

1. A method for detecting a radioactive source moving on a linear path substantially parallel to an alignment of N detectors, N being an integer equal to or greater than 2, the method comprising: simultaneously detecting N signals by N detectors;delivering N×Nt detection signals from the N detectors

1. A method for detecting a radioactive source moving on a linear path substantially parallel to an alignment of N detectors, N being an integer equal to or greater than 2, the method comprising: simultaneously detecting N signals by N detectors;delivering N×Nt detection signals from the N detectors in the form of a succession over time of Nt sets of the N signals simultaneously detected by the detector over a duration Δt, Nt being significantly greater than N, a pulse counting value representing a number of pulses detected by a detector over a duration Δt;forming N×Nt pulse counting values Mi,t (i=1, 2, . . . , N and t=1, 2, . . . , Nt) from the N×Nt detection signals;computing, using a computer: a set of NR correlation products Rz so that: Rz=Πi=1NMi,[(N−i)z+1] (z=1,2, . . . , NR)with NR being an integer equal to Nt-1N-1,a statistical mean R of the Nt products Πi=1NMi,t such that: R_=1Nt⁢∑t=1Nt⁢⁢∏i=1N⁢⁢Mi,ta standard deviation σ(R) of the Nt products Πi=1NMi,t, anda correlation condition for each correlation product Rz; anddetermining that a radioactive source moved in front of the detectors if Rz≧R+K2σ(R), K2 being a scalar, ordetermining that no radioactive source moved in front of the detectors if Rz