[en] In order to clean some low radioactive contaminated waters containing beta + gamma-active cations (⁵⁵⁺⁵⁹Fe³⁺, ⁶⁰Co²⁺, ⁶⁵Zn²⁺ and ¹³⁷Cs⁺), calix[4]arene and p-(tert-butyl)calix[4]arene have been used. Experiments have been performed in the absence of ionic competition, at 4 deg C, 22 deg C and 40 deg C. Whatever the temperature and the sorbent used, the yield of retaining the beta + gamma-active cations varies as follows: ⁵⁵⁺⁵⁹Fe³⁺ > ⁶⁰Co²⁺ > ⁶⁵Zn²⁺ > ¹³⁷Cs⁺. (author)