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As for dead time, the data in the table are counts per minute, so the dead time is being shown in minutes. The number listed 4e-6 minutes. In seconds this would be 2.4e-4 s, which is indeed, as Bernard suggested, a couple hundred microseconds. Dead time was measured in the standard way of counting a split source. In this case a beta source. I don't recall for sure, but think each half of the source was about 10,000 cpm, so you count each source alone, then together, and notice that 10,000 plus 10,000 only yields perhaps 17,000 (when counted simultaneously), so dead time is calculated from this. Note, these count rates for dead-time measurement are made-up numbers, but I think they are in the correct ballpark.