[en] Our analyses indicate that more in-depth research should be done on ³H, ¹⁴C, ⁹⁹Tc, and ²³²U, especially because of their presence in nonproliferative fuel cycles. For increased ³H production by fast reactors, we can only speculate that such research could show that environmental releases might be significantly greater than for LWRs. Carbon-14 will likely not be a problem if a suitable decontamination factor can be agreed upon for reprocessing facilities and if a satisfactory regulatory limit can be established for global populations. Additional experimental research is urgently needed to determine the uptake of low levels of ⁹⁹Tc by plants. These data are essential before an accurate assessment of ⁹⁹Tc releases can be made. Finally, we recommend that investigators take a closer look at the potential problems associated with ²³²U and daughters. This radionuclide could contribute a significant portion of the dose in both environmental and occupational exposures from the nonproliferative fuels