ɹˈeɪnwɔːɾɚ kæn biː hˈaɪli ɹˌeɪdɪoʊˈæktɪv dˈuː tə hˈaɪ lˈɛvəlz ʌv ɹˈeɪdɑːn ænd ɪts dᵻkˈeɪ pɹˈɑːdʒəniz tˈuːhˈʌndɹɪd fˈoːɹtiːn bˈaɪ ænd tˈuːhˈʌndɹɪd fˈoːɹtiːn pˌiːbˈiː; ðə kˌɑːnsəntɹˈeɪʃənz ʌv ðiːz ɹˌeɪdɪoʊˈaɪsətˌoʊps kæn biː hˈaɪ ɪnˈʌf tə sˈɪɹiəsli dɪsɹˈʌpt ɹˌeɪdɪˈeɪʃən mˈɑːnɪɾɚɹɪŋ æt nˈuːklɪɹ pˈaʊɚ plˈænts.
Rainwater can be highly radioactive due to high levels of radon and its decay progenies 214Bi and 214Pb; the concentrations of these radioisotopes can be high enough to seriously disrupt radiation monitoring at nuclear power plants.