Spark counter. Illustration showing a spark counter with a sample of radium, a source of ionizing radiation, held close to it. A spark counter consists of a wire below a metal gauze, with a high voltage applied between them. A radioactive source such as radium, which emits alpha particles, ionizes the air between the gauze and wire creating sparks.

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TOP26152438

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達志影像

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RM

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須由TPG 完整授權

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