| 摘要 |
A method of collecting data on radioactive material includes: positioning a detector unit at a first position relative to the environment; collecting at least a part of a first set of data from a first position using a detector unit; and collecting at least a part of one or more subsequent sets of data on the environment from one or more subsequent positions using the detector unit; wherein one or more of the subsequent positions is determined, at least in part, by considering at least a part of the data of one or more of the sets of data previously collected. The subsequent positions are determined so as to improve the information on the radioactive material provided as a result of the data collected from that position.
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