Abstract: A gamma ray detector module includes at least one scintillation detector configured to operate in a dot-decoding mode, or at least two scintillation detectors configured to operate in a line-decoding mode, wherein the at least one scintillation detector is each coupled to a single photodetector, and wherein the at least two scintillation detectors are coupled to at least two photodetectors arranged substantially along a line; and at least four scintillation detectors configured to operate in a plane-decoding mode, wherein the at least four scintillation detectors are coupled to a plurality of photodetectors arranged in a two-dimensional array.

Abstract: An electrical wrench includes a motor and a drive shaft driven by the motor. A transmission body is mounted on the drive shaft for rotating synchronously therewith and has an accommodating space. A wrench shaft has a follower member extending into the accommodating space. A swing member has an axial positioning protrusion and is pivoted within the accommodating space about an axis offset and parallel to the axis of rotation of the transmission body. The swing member can swing to an engaging position with the follower member to transmit rotation when the transmission body is rotated to a high speed. A shoe assembly is biased to clamp the swing member to disengage the swing member from the follower member and releases the swing member to the engaging position by virtue of the centrifugal force induced at the high speed of the transmission body.