Posted: 3/18/2011 7:31:07 PM EDT
| It'll be interesting to see what they are priced at, always a couple tables with them. I'm betting they had a "significant" price hike recently for some strange reason. |
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judging by the construction they were for gama only. Actually, the CDV-700 geiger counter's shield rotates to expose the GM tube for measuring beta as well as gamma. The -715 and -717 were gamma only, and the -720 had a sliding shield over the ion chamber to also allow beta measurements. The 715, 717, and 720 meter relatively high levels of radiation. The 700, being a geiger counter, can measure much lower levels of radiation. There's a good write-up here: http://en.wikipedia.org/wiki/Civil_Defense_geiger_counters I'm in the middle of a project to restore a CDV-777 set, including a -700, -715, -717, and a -750 dosimeter charger with a handful of -742 dosimeters. |
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I bought a brand new never used cold war bright yellow one 25 years ago , still has never had batteries in it ! Wonder if it's worth anything ......  If it's one of the (slightly) newer versions it will run on D cells. Some of the oldest units also required two 45V batteries, and those are really expensive. If yours takes D cells throw in a handful and fire it up. A lot of these will power up, self-check, and zero just fine, but won't take accurate measurements. The electronics inside are very simple, though, so restoring them to functional is feasible. Now, getting it calibrated once it functions is something else entirely. It's still a cool piece of history. 
(edited for spelling) |
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Quoted:
I bought a brand new never used cold war bright yellow one 25 years ago , still has never had batteries in it ! Wonder if it's worth anything ...... If it's one of the (slightly) newer versions it will run on D cells. Some of the oldest units also required two 45V batteries, and those are really expensive. If yours takes D cells throw in a handful and fire it up. A lot of these will power up, self-check, and zero just fine, but won't take accurate measurements. The electronics inside are very simple, though, so restoring them to functional is feasible. Now, getting it calibrated once it functions is something else entirely. It's still a cool piece of history.
(edited for spelling) If I remember correctly , it looked like it took D cells , I'll see if I can find it and post some pics tomorrow ! |
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I want one, but not because of Japan. I just think it would be neat as hell to run around seeing what type of stuff gave off how much radiation. You'd get about ~0.02 mR/h activity for the most part. Unless you work in a nuke-related fields, I can think of better things to spend my money on. I wouldn't trust the accuracy/sensitivity of 'gun show' G-counters any more than I could trust "Unintended Consequences" to be non-fiction. |