The unconditional derived release limit (URL) in units of becquerels per kilogram or becquerels per meter cubed is equal to 0.1 millisieverts per year divided by the total dose from soil in units of millisieverts per year per becquerel per kilogram for soil or 0.1 millisieverts per year divided by the total dose from air in units of millisieverts per year per becquerel per meter cubed for air (Dtotal,soil/air).