-The 1T polytype of TaS 2 exhibits voltagetriggered threshold switching as a result of a phase transition from nearly commensurate to incommensurate charge density wave states. Threshold switching, persistent above room temperature, can be utilized in a variety of electronic devices, e.g., voltage controlled oscillators. We evaluated the total-ionizing-dose response of thin film 1T -TaS 2 at doses up to 1 Mrad (SiO 2 ). The threshold voltage changed by less than 2% after irradiation, with persistent self-sustained oscillations observed through the full irradiation sequence. The radiation hardness is attributed to the high intrinsic carrier concentration of 1T -TaS 2 in both of the phases that lead to threshold switching. These results suggest that charge density wave devices, implemented with thin films of 1T -TaS 2 , are promising for applications in high radiation environments.

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