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I use a Mazur-PRM 8000. Its $450.08 on Amazon with Prime. They have a PRM-9000 but its $562.00. I know they are pricey but the 8000 is more rugged albeit not as sensitive as the 9000. They both are good professional grade instruments. You probably will need the accessory cord to download the data that they can log. Follow the comments for getting and setting up the software, its free. Download the user manual and set it up in a 3 ring binder to get used to using the Mazur. Do your own study on units and exposure limits so you don't get prematurely excited.

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.

http://www.amazon.com/Mazur-Instruments-PRM-8000-Handheld-Radiation/dp/B005TDE3X8/ref=sr_1_1?ie=UTF8&qid=1394415934&sr=8-1&keywords=prm+8000

http://www.amazon.com/Mazur-Instruments-PRM-USB-Geiger-Counter/dp/B006T6T398/ref=sr_1_9?ie=UTF8&qid=1394416129&sr=8-9&keywords=prm+8000

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.