And this is exactly what happened with Marsden who discovered that when he shot the alpha particles at the gold foil he detected something on his detector that click, click, click went a little bit faster.

而对于Marsden来说,就是这样，他发现当他用alpha粒子,轰击金箔的时候，探测器哒哒哒得更快了,他发现一分钟。

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Over 15 years, he returned 70 times with a metal detector built for gold prospecting.

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Bud Guthrie, an amateur gold hunter, found it while prospecting with his metal detector in 1989 in a Colorado River canyon.

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Alongside this experiment, another large detector - LUX - which is in a gold mine in South Dakota in the US will soon be coming online.

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