Practical Measurements in Radio Activity
Practical Measurements in Radio Activity
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On transferring the plate to an a-ray electroscope, its activity will again be found at first to decay rapidly, showing that actinium B has been partially dissolved by the acid. * 54. Comparison of the Rates of Decay of the Emanations.
The emanations from radium, thorium and actinium have very different rates of decay. This can be illustrated by blowing them into an emanation electroscope (fig. 17) and observing the rate of disappearance of the activity in each case.
Thorium and actinium emanat...ions are most easily intro- duced by bubbling air through a solution of the active material into the electroscope. After the current has been allowed to pass for about a minute, the electroscope is closed and the variation of activity at once measured. With thorium emanation it will be found that the activity falls to half value in 53 seconds ; with actinium emanation the whole activity of the emanation disappears in a few seconds, leaving a small residual activity due to the active deposit. The rate of decay of actinium emanation is too rapid to be measured in this way, but the determination can be made by a method given in 55.
What to read after Practical Measurements in Radio Activity?
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To quickly assess the difficulty of the text, read a short excerpt:
On transferring the plate to an a-ray electroscope, its activity will again be found at first to decay rapidly, showing that actinium B has been partially dissolved by the acid. * 54. Comparison of the Rates of Decay of the Emanations.
The emanations from radium, thorium and actinium have very different rates of decay. This can be illustrated by blowing them into an emanation electroscope (fig. 17) and observing the rate of disappearance of the activity in each case.
Thorium and actinium emanat...ions are most easily intro- duced by bubbling air through a solution of the active material into the electroscope. After the current has been allowed to pass for about a minute, the electroscope is closed and the variation of activity at once measured. With thorium emanation it will be found that the activity falls to half value in 53 seconds ; with actinium emanation the whole activity of the emanation disappears in a few seconds, leaving a small residual activity due to the active deposit. The rate of decay of actinium emanation is too rapid to be measured in this way, but the determination can be made by a method given in 55.
What to read after Practical Measurements in Radio Activity?
You can find similar books in the "Read Also" column, or choose other free books by W Walter Makower to read onlineMoreLess
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