| Popis: |
A simple method of obtaining the ventilation rate in a thoron field and the relative non-equilibrium among the decay products of thoron is described. It is indicated how the ratio of the alpha activity after a delay of 150 min to that after a delay of 30 min can be used as a convenient parameter to do this. Curves are given showing the variation of the potential alpha energy values for thoron and radon daughters with the ventilation rate, which are useful when planning control by means of ventilation. (auth) |
