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Dascha
Switzerland
1 Posts |
 Posted - 11/21/2025 : 00:42:46
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Hello,
I have a GMC 320 that I wanted to take to my trip to Japan to check levels in Nagasaki. My trip was on a cruise ship. Out of fun I tried it on the Pacific ocean, but it scared the hell out of me.
Between Los Angeles and Hawai, the meter went crazy.
So my question: Does the counter work properly on the sea with high humidity. Or does the salt in the air alter the measurements?
Also, the meter starts counting upwards until around 63 and then it jumps to 280. During 2 days in the Pacific, by measuring on the balcony of my cabin, it even went up to 12234 cpm.
In Nagasaki it "only" measured around 3000 cpm.
Thank you for your feedback. Anybody experienced something similar?
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Dascha P. |
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| Reply #1
ullix
Germany
1228 Posts |
Posted - 11/21/2025 : 01:33:14
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Oh, they forgot to tell you the ship has a nuclear reactor? ;-)
I had been out on the ocean on a little sailboat, and the background you measure is typically less of what you get over land, because there isn't all this radiating stuff from soil. Most of that is K-40, perhaps some Uranium and its daughters.
First step to take: search in the counter's menu whether it has a "FET" setting, and switch it Off. It is Off when set to 60 (sec). Please, also look up what firmware version your device has, and post it.
My guess is you should see an average of CPM=10...15 when on the balcony, and even less when inside, because of shielding from cosmic rays by the big iron around you.
If FET is off and you still see such monster readings your counter is defect and needs service.
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Readings on ships
