Have you done a wipe test on those pendants to see if any radioactive material comes off onto the paper?

Did it come with that case?? That it was in to prevent scratches and other stuff

Интересный аппарат!

Can someone share video or picture of graph view when there is gaama radiation on 600+

Should I get the GQ GMC 600 or the GMC 600+

I have the GMC-600 SBT-11 variant. From my experience either the tube is undervolted or the CPM setting is too high. I had to change voltage and recalibrate mine to make it accurate. With Am-241 I get 390 uSv/h and around 128000 CPM with 300 CPM/uSv/h, a dead time of 69 microseconds and a voltage of 62.67%(though I don't recommend that high voltage if you keep the metal mesh in front of the tube as it produces induction currents) and no auto-voltage. Note that not all SBT-11 tubes will like this as those already sensitive at background will instead produce very high counts at this voltage. But it is more in line with what I've seen other devices produce from 0.9 uCi Am-241. The tube's background is around 20 CPM and lower than most but I got good detection otherwise. I intend to test its upper limit with a DP-63-A radium scale. I get about 1.1 uSv/h from tritium which is another good test for mica window sensitivity. I didn't know the SBT-11 variant was still in production. Mine did not come with the pretty velcro case and came with a cheap black pouch. The original device came with a SBT-11A tube which behaved oddly and produced sporadically high readings(with default settings) and was not reliable. I replaced it with a SBT-11 which is actually more sensitive than the original SBT-11A so no matter how much the thinner "A" variant window might help with alpha sensitivity, the tube's internal sensitivity can vary a lot too. Other than that, the buttons become difficult to press after a while and require more force/"massaging" to register a press. It's not the end of the world but it is annoying, though I suppose the GMC600 SBT-11 variant is probably the cheapest alpha geiger you can find. The SBT-11 supposedly can reach up to 3-4 millisieverts/hour, you should test that.

@Dozymetria

3 жыл бұрын

Thank you for your valuable comment! I noticed that my GMC-600 shows a background usually lower than other dosimeters (around 0.5 uSv/h instead of 0.10-0.13 uSv/h). How much CPM does your natural background indicate on average? I love this dosimeter, it has many configuration options :)

@SearinoxNavras

3 жыл бұрын

@@Dozymetria My background on this device hovers around 20CPM with as high as 50 and as low as 5. So a lot of variation. So from the GMC-600 an average of 0.067 uSv/h. The background at my place as judged by other dosimeters is also around 0.1-0.13 uSv/h so yes the background of the SBT-11 is rather low. The configuration options give you a lot in terms of recallibrating it and you should be able to increase its sensitivity with a little extra voltage and fiddling with the conversion rate to get it in line with your other dosimeters.

@noname-style

6 ай бұрын

​@SearinoxNavras so it doesn't come accurate from the box? I'm lost. Please explain

Does this dosimeter include some audio jack connector ?

@Dozymetria

4 ай бұрын

Yes

Hi, what do you think of the RADEX OBSIDIAN vs this unit ?

@Dozymetria

3 жыл бұрын

Both are for slightly different purposes, so it's hard to tell what you want to use the dosimeter for?

@LORFCASTER

3 жыл бұрын

​@@Dozymetria Testing backround radiation of different areas and random objects / surfaces. Testing X-Ray dosages at the dentist. Just at home use with interest in high quality , accurate, fast response times.

Thats a nice device. What kind of battery does it use? And how much did it cost? Is it well-built or does it feel cheap?

@Dozymetria

3 жыл бұрын

18650 battery, easy to buy a new one if you ever need it. The housing is not the best, but it is the most customizable dosimeter on the market

@maxwellcatlol

Жыл бұрын

@@Dozymetria Hmm, thought it was a geiger counter, See, dosimeters read your dose, not the rate. Geiger counters read what they are currently reciving, not how much u have got.

Do you know what's roughly the highest cpm the sbt-11 can go to? I have a sbt-10 (that in theory is about the same thing) and it pretty much saturates at about 250k even when it should be much higher

@Dozymetria

3 жыл бұрын

Unfortunately, I don't know, but I think it may be similar

@SOVIET_NIET

Жыл бұрын

in the website it says "Detection Dose Range: 0 ~ 4250uSv/h Detection CPM Range: >1,000,000 CPM"

first thought, you show us a camera)) But no, it`s dosimeter. He has a mica sensor?

@Dozymetria

3 жыл бұрын

sorry but I don't understand the questions :3

@vesna6292

3 жыл бұрын

@@Dozymetria his detector - pancake G-M tube?

@Dozymetria

3 жыл бұрын

@@vesna6292 SBT-11 mica window GM :)

Недавно приобрёл дозиметр Radex Obsidian. Очень нравится!

@Dozymetria

3 жыл бұрын

Я этого не знаю Radex. Я скоро займусь поиском в гугле

@odstavec-900mm6

3 жыл бұрын

@@Dozymetria, я снял три видео.

Are you going to review Mirion DMC 3000?

@Dozymetria

Жыл бұрын

Maybe someday, I don't have it now

@dymytryruban4324

Жыл бұрын

@@Dozymetria I think the best option may be to arrange a visit to MARIA reactor. Some personnel there may have it. Also DMC 3000 can support beta, neutron and telemetry modules. I don't think you can find neutron radiation elsewhere and the dosimeter is of wide range and not particularly sensitive so it will only react to decent sources of ionizing radiation (e.g. taking chest X-ray). In Montreal, my DMC 3000 displays 1 microSievert of gamma (H10) in about 16-18 hours. Some settings such as switching units of measurement are only possible on dedicated equipment which calibration services have.

👍

Was told by GQ Electronics in the US around a year ago that this SBT-11 version had been discontinued & that the LND 7317 version is the only one now available...hmmm. Sounds like they were lying in order to try & sell the more expensive LND model? With the comments about this arriving poorly calibrated & the known issues with the 500+....I don't think I'd bother with or trust this US headquartered - made in China brand to be totally frank. Add to this the import charges etc to the UK etc...

@Dozymetria

3 жыл бұрын

When did you want to buy version 600? Due to the limited quantity of the SBT-11 Geiger counters, the quantity was limited. The LND 7317 is a much better GM counter than the SBT-11 (In my ranking, LND 7317 is the best one for measuring alpha radiation).

@andrewjackson246

3 жыл бұрын

@@Dozymetria Hi, I considered the 600+ version back in 2019 but after reading lots of blogs about the 500+ regarding its hardware & software shortcomings... & learning of the import duties from the US, I decided not to bother. Also, given the delicate nature of the LND7317 mica membrane, there was no indication in my correspondence with GQ electronics, that they would send the unit in a sturdy air- tight container to protect the sensor from changes in atmospheric pressure during transportation by air. These have been known to..."POP" in transit & cost around £150 to replace. The Soviet/Russian "alpha" GM tubes have thicker mica membranes so are usually more resistant to rupture though they are a little less sensitive.

@SupremeSkeptic

3 жыл бұрын

@@andrewjackson246 GQ pulled the GMC 600 listing on amazon on the very day I decided to buy it. So I backordered it on GQ's website. It was shipped the next day.

@andrewjackson246

3 жыл бұрын

@@SupremeSkeptic Is that the SBT-11 version? I bought an SBT-11 equiped GM counter from Arturas in Lithuania for around £80. The casing is a little rough, as it was 3D printed, but the unit works well & is accurate after a few adjustments.

@SupremeSkeptic

3 жыл бұрын

@@andrewjackson246 yes, I believe mine is the SBT-11 version. I bought it for about USD220, slightly lower than Amazon's listing