The USB-6009 is a poor choice for use with temperature sensors because it lacks the cold junction compensation needed for thermocouples and the precision current source needed for RTDs and thermistors. It also has low resolution and accuracy and a fixed +/- 10 V range. If you wanted to use it, you'd almost certainly need external signal conditioning to make it at all useful.
Right now, you have an acquisition device and are asking what sensor you can use with it. You should do the opposite and first try to select the appropriate sensors for your application and then ask for the correct acquisition device to interface with the sensor. There is tons of material online, including from NI (e.g., https://www.ni.com/en-us/innovations/white-papers/06/overview-of-temperature-sensors.html), that goes into how to select a temperature sensor. You'll want to consider things like cost, accuracy, and form factor. Form factor might be particularly important for your application given that you want to measure body temperature. I'm not sure how easy it will be to adhere a typical thermocouple to a person, for example. Maybe you want an infrared sensor or a more medical grade tool. You need to define those parameters and do the research. Once you have the sensor you want, then I'd reach out to your NI sales rep to help selecting the appropriate acquisition hardware. Either way, the USB-6009 is almost certainly going to be unsuitable.
