The study conducted by Moscow Institute of Physics and Technology (MIPT) concluded this after they observed that mice exposed to neutron and gamma radiation did not impact the rodents' intellectual capabilities.
ðə stˈʌdi kəndˈʌktᵻd baɪ mˈɑːskoʊ ˈɪnstɪtˌuːt ʌv fˈɪzɪks ænd tɛknˈɑːlədʒi mˈɪpt kəŋklˈuːdᵻd ðɪs ˈæftɚ ðeɪ əbzˈɜːvd ðæt mˈaɪs ɛkspˈoʊzd tə nˈuːtɹɑːn ænd ɡˈæmɚ ɹˌeɪdɪˈeɪʃən dɪdnˌɑːt ˈɪmpækt ðə ɹˈoʊdənts ˌɪntəlˈɛktʃuːəl kˌeɪpəbˈɪlᵻɾiz.