| 摘要 |
An angle-responsive sensor, comprising: a radiation detector adapted to detect ionizing radiation; at least one radiation absorbing element arranged to block radiation from reaching said detector in a manner dependent on a relative orientation of a radiation source, said detector and said element, said detector and said element defining an aim for said sensor; and circuitry coupled to said detector and which generates an output signal which varies as a function of said relative orientation, wherein said detector and said element are arranged to have a working volume of at least 10 cm in depth and having an angular width, such that said signal defines an accuracy of better than 3 mm within one standard deviation, over said working volume.
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