ɪn ˈɔːɹdɚ tə kˌaʊntɚɹˈækt ðˈɪs, ðɪ ɛkspˈɛnsɪv ænd smˈɔːl hˈaɪ ɹˌɛzəlˈuːʃən dɪtˈɛktɚɹ ɪz sɚɹˈaʊndᵻd baɪ lˈɑːɹdʒɚ ænd tʃˈiːpɚ lˈoʊ ɹˌɛzəlˈuːʃən dɪtˈɛktɚz, jˈuːʒuːəli sˈoʊdiəm ˈaɪədˌaɪd sˈɪntɪlˌeɪɾɚz.
In order to counteract this, the expensive and small high resolution detector is surrounded by larger and cheaper low resolution detectors, usually sodium iodide scintillators.