ðə mˈeɪn dɪtˈɛktɚ ænd ðə səpɹˈɛʃən dɪtˈɛktɚɹ ɑːɹ ɹˈʌn ɪn ˈæntaɪkoʊˈɪnsɪdəns, wˌɪtʃ mˈiːnz ðæt ɪf ðeɪ bˈoʊθ dɪtˈɛkt ɐ ɡˈæmɚ ɹˈeɪ ðˈɛn ðə ɡˈæmɚ ɹˈeɪ hɐz skˈæɾɚd ˌaʊɾəv ðə mˈeɪn dɪtˈɛktɚ bᵻfˌoːɹ dᵻpˈɑːzɪɾɪŋ ˈɔːl ʌv ɪts ˈɛnɚdʒi ænd ðə dˈeɪɾə ɪz ɪɡnˈoːɹd.
The main detector and the suppression detector are run in anti-coincidence, which means that if they both detect a gamma ray then the gamma ray has scattered out of the main detector before depositing all of its energy and the data is ignored.