GQ Electronics Technical Support Forum Active Users: / Visits Today:
Highest Active Users:
GQ Electronics Technical Support Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 GQ Electronics Forums
 2.GQ Geiger Muller Counter
 Smashed through the Million CPM barrier.

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize:
UserName:
Password:
Format Mode:
Format: BoldItalicizedUnderlineStrikethrough Align LeftCenteredAlign Right Horizontal Rule Insert HyperlinkInsert EmailInsert Image Insert CodeInsert QuoteInsert List Spell Checker
   
Message:

* HTML is OFF
* Forum Code is ON
Smilies
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Clown [:o)]
Black Eye [B)] Eight Ball [8] Frown [:(] Shy [8)]
Shocked [:0] Angry [:(!] Dead [xx(] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

   Insert an Image File
Check here to include your profile signature.
    

T O P I C    R E V I E W
Pilot25dmc Posted - 04/19/2020 : 16:39:30
I purchased a Soviet DP-63-A Geiger Counter from Ukraine.

Its pretty famous for having a Radium painted dial of biblical proportions.

Measured with my laboratory standard Fisher rate meter it sends it off scale so I decided to test with the 500+.

Measurement taken from 1cm above the dial which is in a plastic bag.

The photo speaks for itself.

Image Insert:

67774 bytes
10   L A T E S T    R E P L I E S    (Newest First)
jlp1528 Posted - 06/10/2020 : 03:23:18
Another video: https://youtu.be/f2lRiWsf4KE
I wonder which model you have. Could you please add pictures of the unit itself?
jlp1528 Posted - 05/23/2020 : 10:48:25
Less than an hour on these forums and already I've found more radioactive stuff to waste my money on invest in...

Seriously though, thanks for posting. Couldn't help but grab not one but TWO of these listed on Etsy, both in excellent condition with cases! Not only is it probably the most radioactive thing I will ever own, but it also happens to have Strontium 90 as a bonus?! I've been looking to check that box on the list of isotopes since I started collecting radioactive things months ago! Shut up and take my money!

Now hopefully they get through the mail without issue... One from Belarus, one from Ukraine. Wish me luck here in the USA!
Searinox Posted - 05/21/2020 : 12:56:20
quote:
Originally posted by Damien68

I found a video about it:
https://www.youtube.com/watch?v=Aiv4SA_9zPQ

but is it a backlight/(back of reading window) of Soviet DP-63-A Geiger Counter or a test and calibration part coming with?
with your lead pig, don't forget many yellow sticker :)




Ironically it's just the radium on the dial. The counter does come with a Sr-90 check source which is highly ironic as it's both much lower in intensity and shorter-lived than the display itself. I really don't know what they were thinking, maybe they outsourced the different parts to different manufacturers who didn't have the bigger picture...?
ZLM Posted - 05/19/2020 : 23:12:47
Thanks for sharing.
Damien68 Posted - 05/19/2020 : 22:22:28
I found a video about it:
https://www.youtube.com/watch?v=Aiv4SA_9zPQ

but is it a backlight/(back of reading window) of Soviet DP-63-A Geiger Counter or a test and calibration part coming with?
with your lead pig, don't forget many yellow sticker :)

Searinox Posted - 05/18/2020 : 04:28:44
I can assure you this is real. I think the radium dial on this particular counter model is just about the most radioactive item you can legally own. Measured with different counters, these dials register around 3-10 millisieverts per hour.
Pilot25dmc Posted - 04/22/2020 : 08:13:38
Just adding some pictures for context.

I will carry out further experiments using your guide.

I have also ordered a lead pig to hold the sample.

Image Insert:

1440426 bytes
ullix Posted - 04/22/2020 : 07:04:47
You sure have a nice collection of counters!

They all agree that you may have a genuine hazmat problem. Think of a proper way to get rid of that thing!

Perhaps after you have taken a few more measurements:

- as some counters maxed out, I would repeat the measurement from a distance, where no counter is much beyond the mid of their range.

- with that distance, try to figure out whether it is gamma or beta. Do this: use a sandwich consisting of a) a sheet of 2-3 mm plastic (if not available, use 30 pages of copy paper) facing the sample, and b) a sheet of 1mm ... 3mm of steel, or copper, or aluminum, or glass facing the counter. For reasons see Potty Training and chapter about range and Bremsstrahlung.

Make sure the ziplock bag remains closed and does not rupture!



Pilot25dmc Posted - 04/21/2020 : 08:27:51
I used the following meters with the radioactive source in a ziplock bag held 1cm from the tube or window.

With a Thermo Fisher 900D Rate Meter, with an Alpha, Beta and Gamma probe. The dial maxed it out immediately at 1mSv/h.

Terra-P+, (Beta shield removed) gave me 9mSv/h.

RadAlert 50, maxed out at 50mR/h.

Radiascan 701A (Beta shield removed) gave me 7mSv/h.
ullix Posted - 04/20/2020 : 00:40:16
Impressive picture, indeed.

But I am suspicious about it being real. This is now the 4th report within a week to show wild numbers with a 500plus:

http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=9017
http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=9027
http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=9002

plus one with a GMC600
http://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=8859

At least in one case (see ***9002) it is claimed to be solved by switching off the 2nd tube. Try that also.

Though you had already used a Fisher meter for comparison? Can you describe what this is?

Still, I suggest to validate your 500+ with Potassium; see my "Potty Training".

Since there is a good chance for most counts coming from beta, the calibration is meaningless. However, if it were real, then 10mSv/h gives you the "Occupational radiation limit for Germany" in just 2 hours and for the US in 5 hours.

I don't think the Russians were considered that much harder to be running around with such a device.

If this were true, you have a serious hazmat problem!

GQ Electronics Technical Support Forum © Copyright since 2011 Go To Top Of Page
Generated in 0.06 sec. Snitz's Forums 2000