Optix Hit.t data represented as unsigned int

I have performed ray tracing using Optix 8.0 on mesh data. The output for intersection of rays with the mesh is represented as a float, but is always truncated to the lowest integer (like a floor function). This is in the “Hit” data structure, represented as the “t” data.

Is there a way to run ray tracing so the full float data is there for the hits (non-truncated)?