| 摘要 |
A person intervening on the site is fitted with a plurality of radioactivity meters (1, 2, 3, 4, 11, 12) distributed over the body at locations such that at least two meters receive radiation doses that are different due essentially to the screen constituted by the body of the intervener, and the radiation doses received simultaneously by the meters are compared to deduce therefrom information concerning the direction towards the source relative to the intervener.
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