| US 7,518,117 B2 | ||
| Unidimensional array 3-D position sensitive ionization detector | ||
| Douglas Bryman, Vancouver (Canada) | ||
| Assigned to Advanced Applied Physics Solutions, Vancouver (Canada) | ||
| Filed on Mar. 18, 2005, as Appl. No. 11/83,304. | ||
| Claims priority of provisional application 60/554346, filed on Mar. 19, 2004. | ||
| Prior Publication US 2005/0205796 A1, Sep. 22, 2005 | ||
| Int. Cl. G01T 1/24 (2006.01); G01T 1/20 (2006.01) | ||
| U.S. Cl. 250—370.1 [250/370.11] | 20 Claims |
| 1. A method for determining the position of energetic particle interactions within a detector, the method comprising:
providing a drift medium within the detector;
allowing an energetic particle to interact with the drift medium and thereby produce ionization electrons at an interaction
location;
generating an interaction signal indicating that an interaction between the energetic particle and the drift medium has occurred;
establishing a drift field within the drift medium whereby the ionization electrons are directed toward an induction array
and a collector, wherein the induction array comprises a plurality of conductive elements mounted at an offset angle relative
to the collector;
providing a shield array between the interaction location and the induction array;
opening a portion of the shield array corresponding to a first plurality of coordinates for a period of time during which
the ionization electrons are expected to reach the shield array, thereby selectively allowing the ionization electrons to
pass through the shield array and move toward a portion of the induction array; and
detecting the ionization electrons at the induction array for determining at least one coordinate corresponding to the interaction
location.
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