Chapter 31/32 Part 1 1. Suppose a particle of ionizing radiation deposits 1 MeV in the...

Chapter 31/32 Part 1

1. Suppose a particle of ionizing radiation deposits 1 MeV in the gas of a Geiger tube, all of which goes to creating ion pairs. Each ion pair requires 30.9 eV of energy. The applied voltage sweeps the ions out of the gas in 0.6 ?s . What is the current in nA?

2. A nuclear physicist finds 1.5 ?g of ²³⁶U in a piece of uranium ore, which has a half-life of 2.1×10⁷ y. Calculate the amount of mass of ²³⁶U that would had to have been on Earth 8.1×10⁸ y ago for 1.5 ?g to be left today.

3. A particle of ionizing radiation creates 4500 ion pairs in the gas inside a Geiger tube as it passes through. What minimum energy in 10^-15 J was deposited, if 21.1 eV is required to create each ion pair?

4. If a 1.57 cm thick piece of lead can absorb 90.1% of the ? rays from a radioactive source, how many centimeters of lead are needed to absorb all but 0.06% of the ? rays?

Expert Solution

genius_generous answered 2 years ago

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