The lifetimes of the first excited $2^{+}$, $4^{+}$, and $6^{+}$ states in ${}^{98}\mathrm{Zr}$ were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ${}^{98}\mathrm{Zr}$ were populated using the fission reaction between a $6.2\mathrm{MeV}/\mathrm{u}$ ${}^{238}\mathrm{U}$ beam and a ${}^9\mathrm{Be}$ target. The $\gamma$ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small $B(E2;2_1^{+}\to 0_1^{+})$ value in ${}^{98}\mathrm{Zr}$, thereby confirming the very sudden onset of collectivity at $N=60$. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Doses from the exposure to outdoor radon are typically an order of magnitude smaller than those from indoor radon, causing a greater interest on investigation of the latter for radiation protection issues. As a consequence, assessment of radon priority areas (RPA) is mainly based on indoor radon measurements. Outdoor radon measurements might be needed to guarantee a complete estimation of radiological risk and may help to improve the estimation of RPA. Therefore, authors have analysed the available literature on outdoor radon to give an overview of outdoor radon surveys and potential correlation with indoor radon and estimation of RPA. The review has shown that outdoor radon surveys were performed at much smaller scale compared to indoor radon. Only a few outdoor radon maps were produced, with a much smaller density, covering a larger area, and therefore putting doubt on the representativeness of this data. Due to a large variety of techniques used for outdoor radon measurements and requirement to have detectors with a high sensitivity and resistance to harsh environmental conditions, a standardised measurement protocol should be derived. This is no simple endeavour since there are more applications in different scientific disciplines for outdoor radon measurements compared to indoor radon.