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Table 1 Nucleus – cytoplasm dose ratio together with the relative effectiveness (found in Fig. 11), the average LET and the relative LET-based RBE compared to the external irradiation for Am241 isotopes in virtual spheroid according to various spatial distributions of isotopes

From: Fluorescent nuclear track detectors for alpha radiation microdosimetry

Isotope distribution: In Nucleus In Cytoplasm On Nuclear membrane On Cell Membrane
Nucleus – Cytoplasm dose ratio 140% 94% 125% 95%
Relative effectiveness a 151% 104% 133% 105%
Average LET (keV/μm) 102 ± 36 128 ± 38 104 ± 49 129 ± 37
LET-based RBE a 0.91 0.93 0.85 0.93
  1. a relative to the external irradiation