I am curious by nature and always wanted one. Its sort of a hobby. Oh btw you don't have to wait till next month. The videos regarding some beaches in CA seem to be accurate. Something is here. The source is unclear insomuch as there is a nuclear waste the dump south of the Farralone Islands.
Thanks so much for the links. This is exactly the information I am seeking. We have talked about getting one for at least a year, and think now is as good a time as any—Yes, plan to do study...would like to get baseline readings and see how they change over time.