Spectrally resolved detection of ionizing radiation

G - Physics – 01 – T

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G01T 1/36 (2006.01) G01T 1/18 (2006.01) G01T 1/185 (2006.01) H01J 47/02 (2006.01)

Patent

CA 2404738

Spectrally resolved detection of ionizing radiation in a detector comprising a chamber (13) filled with an ionizable substance, a radiation entrance (33), an electron avalanche amplification means, and a read-out arrangement (29), comprises introducing a broadband radiation beam (1) into the chamber between and in parallel first and second electrode arrangements for ionization of the ionizable substance and avalanche amplifying said electrons. By means of the read-out arrangement (29) electron avalanches (S X1, S X2, ..., S XN), derivable mainly from ionization in sections (X1, X2, ..., X N) of the chamber that are separated in the direction of the introduced radiation beam, are separately detected. From spectrally resolved absorption data, weighting factors (W11, W21, ..., W M1, W12, W22, ..., W M2, ..., W1N, W2N, ..., W MN) for different spectral components (E1, E2, ..., E M) of the radiation (1) and for different sections (X1, X2, ..., X N) of the chamber are deduced, each of said weighting factors being substantially proportional to the photon flux (.PHI.17, .PHI.21, ..., .PHI.M1, .PHI.12., .PHI.22, ..., .PHI.M2, ..., .PHI.1N, .PHI.2N, ..., .PHI.MN) of the respective spectral component (E1, E2, ..., E M) in the respective section (X1, X2, ..., X N). Finally, by means of said detected electron avalanches (S X1, S X2, ..., S XN) and said weighting factors, the respective detected electron avalanches (S E1, S E2, ..., S EM) that are derivable from ionization by the respective spectral component of said broadband radiation are deduced.

L'invention concerne la détection à résolution spectrale de rayonnement ionisant dans un détecteur comprenant une chambre (13) remplie de substance ionisable, une entrée de rayonnement (33), un système d'amplification à effet d'avalanche, et un système de lecture (29). On introduit un faisceau de rayonnement à large bande (1) dans la chambre entre des premier et second arrangements d'électrode et parallèlement à ces arrangements, pour l'ionisation de la substance ionisable et l'amplification des électrons par effet d'avalanche. Le système de lecture (29) permet de détecter séparément les avalanches électroniques (SX1, SX2, ..., SXN), résultant essentiellement de l'ionisation dans les sections (X1, X2, ..., XN) de la chambre, séparées selon la direction du faisceau de rayonnement introduit. A partir des données d'absorption à résolution spectrale, on établit des facteurs de pondération (W11, W21, ..., WM1, W12, W22, ..., WM2, ..., W1N, W2N, ..., WMN) pour différentes composantes spectrales (E1, E2, ..., EM) du rayonnement (1) et pour différentes sections (X1, X2, ..., XN) de la chambre, chacun de ces facteurs étant sensiblement proportionnel au flux photonique ( phi 11, phi 21, ..., phi M1, phi 12, phi 22, ..., phi M2, ..., phi 1N, phi 2N, ..., phi MN) de la composante spectrale respective (E1, E2, ..., EM) dans la section respective (X1, X2, ..., XN). Enfin, on déduit des avalanches électroniques décelées (SX1, SX2, ..., SXN) et des facteurs de pondération susmentionnés les avalanches électroniques décelées respectives (SE1, SE2, ..., SEM) pouvant être établies à partir de l'ionisation par la composante spectrale respective du rayonnement à large bande considéré.

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