I’ve used these.
Good for measuring dose rate and absorbed dose. I think you can adjust the Q factor too. They won’t do spectroscopy though. They’re roughly in the $400 range.
You can get pen-style personal dosimeters fairly cheaply. They can only measure total dose though, and usually at doses that aren’t useful for most purposes. The have to be recharged separately and that can be a finicky process. They only work for gamma.
For accurate spectroscopy I’ve used this. No clue what it costs.
