Development of a qualitative dose indicator for gamma radiation using lyophilized Deinococcus.
The feasibility of using Deinococcus showing strong resistance to both desiccation and ionizing radiation as a dose indicator of gamma radiation exposure was evaluated. Three Deinococcus strains having different levels of radiation resistance, Deinococcus radiodurans (DRD), Deinococcus radiopugnans (DRP), and the DRD pprI mutant (DRM), were selected to develop an appropriate dose indicator for a broad range of exposures. DRD, DRP, and DRM cultures with different numbers of cells [~10(7) to 10(3) colony forming units (CFU)/100 microliter] were lyophilized and subjected to various doses of gamma radiation to determine a critical dose that inhibited bacterial growth completely. Finally, a combination of DRD at ~10(7) and ~10(6) CFU, DRP at ~10(5) CFU, and DRM at ~10(4) CFU successfully indicated exposure to 5, 10, 20, and 30 kGy of gamma radiation, respectively. This study shows the possibility of developing a qualitative indicator of radiation exposure using Deinococcus.
Research Division for Biotechnology, Korea Atomic Energy Research Institute, Jeongeup, Republic of Korea.
Sangyong
S
Lim
Dusup
D
Song
Minho
M
Joe
Dongho
D
Kim
D015169:Colony Count, Microbial; D034301:Deinococcus / Q000528:radiation effects*; D005720:Gamma Rays; D050296:Microbial Viability / Q000528:radiation effects; D011829:Radiation Dosage