The luminous dials of watches are usually made by mixing a zinc sulphide phosphor with an alpha particle emitter. The mass of radium (mass number 226

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The luminous dials of watches are usually made by mixing a zinc sulphide phosphor with an alpha particle emitter. The mass of radium (mass number 226, half-life 1620 years) that is needed to produce an average of 10 alpha particles per second for this purpose is
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Oct
The luminous dials of watches are usually made by mixing a zinc sulphide phosphor with an alpha particle emitter. The mass of radium (mass number 226, half-life 1620 years) that is needed to produce an average of 10 alpha particles per second for this purpose is half-life 1620 years) that is The luminous dials of [...]
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