From 1961 till 1966 he worked at the Solid State Physics Department of the Research Centre for Nuclear Energy (SCK-CEN) in Mol (Belgium).
fɹʌm nˈaɪntiːnhˈʌndɹɪd sˈɪksti wˈʌn tˈɪl nˈaɪntiːnhˈʌndɹɪd sˈɪksti sˈɪks hiː wˈɜːkt æt ðə sˈɑːlɪd stˈeɪt fˈɪzɪks dᵻpˈɑːɹtmənt ʌvðə ɹᵻsˈɜːtʃ sˈɛntɚ fɔːɹ nˈuːklɪɹ ˈɛnɚdʒi ˌɛssˌiːkˈeɪsˌiːˌiːˈɛn ɪn mˈɑːl bˈɛldʒəm.