Speaker
Description
The three-dimensional (3D) spatial analysis of radioxenon isotopic activity ratios is a powerful approach for the determination of the time of a nuclear event. In contrast to the 2D planar analysis, this method requires at least a triple detection from the same sample among the four CTBT-relevant radioxenon isotopes, which are 131mXe, 133mXe, 133Xe, and 135Xe. One method of the 3D spatial approach applies a virtual time axis. This starts from an imaginary zero point and is used for determining the age by taking decay into consideration. For any measurement entered in the 3D plot time zero can be determined by projecting it on this virtual axis, if it would be caused by a nuclear explosion. The valid range of the virtual time axis is determined by requiring the angle alpha ≤ 0.1° and for a relative age error ≤ 10%. A more sophisticated method can avoid the age error and be applicable for the whole age range. This uses the trajectories of nuclear explosion scenarios in 3D space rather than a virtual time axis. The age of any data point is determined by a perpendicular projection on the nuclear explosion trajectory.
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