DOSIMETER in a KEYCHAIN! | '91 BIRI-2 Radiation Detector

[@bmstylee]

The orange cat energy is strong with this one.

[@ChernobylFamily]

- Meow!

[@joshcarter-com]

The Orange Angel of Chaos

[@ChernobylFamily]

@joshcarter-com AAAAAAA

[@keith_5584]

No cat can resist the urge to knock things over that displease them.

[@darkwinter7395]

@@keith_5584 Or things that do please them. 🐈

[@IcthioVelocipede]

Dosimeters: different all over the world. Cats: same everywhere.

[@ChernobylFamily]

Mnau

[@leopiipponen7693]

A small and functional radiation meter that does not contain expensive components. If every resident of Prypjat had had one like that when the accident happened, many would have avoided the radiation... cats too :)

[@ChernobylFamily]

True, but there is a historical fact that back at that moment authorities did everything to limit access to any meters. Intentionally.

[@aliciaaranda9482]

Fuzik is a beautiful radioactive cat 🐱

[@ChernobylFamily]

He emits soft fur particles.

[@aliciaaranda9482]

@@ChernobylFamily Did the BIRI 2 detects soft fur particles too? 🤔

[@ChernobylFamily]

Seemingly anything in this house detects them. Especially my black trousers.

[@aliciaaranda9482]

@@ChernobylFamily 🤣🤣🤣🤣

[@marcinkowalczyk647]

I must say the cat is the co-host on this one ^.^ !

[@ChernobylFamily]

He is the producer.

[@ІгорЛисенко-ж9н]

Useful thing. It looks like it will be even more useful soon...

[@ChernobylFamily]

Unfortunately, yes.

[@ІгорЛисенко-ж9н]

@@ChernobylFamily btw, I am from Chernihiv. Have a nice day, folk.

[@asicsolutions]

I got one of these at the MIT ham radio flea market back in the 90's. it is a fun little conversation piece. I hope I can find it again.

[@ChernobylFamily]

Cool!

[@TannerTech]

Haha!! I just got one from the MIT ham radio flea market yesterday! Funny that those are still selling here

[@Underestimated37]

Simple yet effective enough to give a general idea of what is going on around you, a good idea for sure during what would’ve been a very anxious time.

[@ChernobylFamily]

This.

[@maxgoldman70]

Котичок дуже кльовий! Зразу видно, що у цього пикатого рудька є файні людиняки)

[@ChernobylFamily]

Дякуємо! Але ще більше він любить корм :)

[@hoedenbesteller]

"3.6 Not great, not terrible.." Most underestimated line ever spoken in radiation level history

[@ChernobylFamily]

It was actually a sarcasm as I am tired of that meme really much:)))

[@Woffy.]

3,6 кнопкових елементів, що працюють на трубці Гейгера напругою 400 В і схемою лічильника в такому маленькому корпусі. Блискуче. 3.6 button cells running a 400v Geiger tube and a counter circuit in such a small package. Brilliant.

[@chriswareham]

Having just rewatched the Chernobyl TV series this week, I caught that reference. I'm glad the makers included so many characters that were based on people such as the miners and the liquidators, as the story of the disaster needs to be known for its impact on ordinary people.

[@ChernobylFamily]

This show is a good start point, but there are too many simplified and overdramatized things. Nevertheless, especially for younger generation it is the thing that brought many to this subject. Then... books, books, books to discover more...:)

[@felixthecleaner8843]

what a beautiful cat!

[@ChernobylFamily]

Purrr!

[@kd5byb]

Hello kitty!!! My cats would do exactly the same thing. I stand up a box, they knock it over. Stand it up, they knock it over.

[@ChernobylFamily]

I lov dat boks. I got food after dis man removed kamera. Sorri for mistakes. Hard to type wiz paws. Fuzik (kat)

[@kd5byb]

@@ChernobylFamily 🤣🤣🤣 Hello Fuzik!!! You are an adorable kitty!

[@ChernobylFamily]

Purrrr!

[@KarinaMilne]

😍😍😍 best reply ever!

[@ferricdelusions]

Soviet era tech never ceases to fascinate me

[@ChernobylFamily]

This is not really soviet, but it is not less fascinating! Those were produced at least up to 1995.

[@neil4306]

Really enjoy your channel

[@ChernobylFamily]

Thank you!

[@neil4306]

​@@ChernobylFamilyYou are welcome

[@KeritechElectronics]

Nice little dosimeter and lovely kitty :) I never saw a GM tube so small.

[@ChernobylFamily]

Thank you! 😊

[@migsvensurfing6310]

Cool device.

[@ChernobylFamily]

It is!

[@tamahagane1700]

I'd buy that any day! So simple and well engineered device. I wish I could find similar unit on the market today. When the Chornobyl accident happened, it was highly unusual for civilians here to own any dosimeters (not available for purchase unless you were an institution), information were scarce and radio-phobia skyrocketed... Btw The Chornobyl Cat is so cool ❤️😸

[@ChernobylFamily]

Meow...!

[@googleevil]

I like this review, reminds me old Aizon videos. Keep it up 👍

[@ruben_balea]

It's not worth for testing the dosimeter but if you find something mains powered that needs them installed to work properly NiMH batteries labeled as V40H or ZM40H have one end wider than the other so you can't put them backwards on devices designed to use those but they fit in place of the LR44. I had a plug timer and a plug thermostat that used that kind of batteries to keep the settings while unplugged or during blackouts. Edit: It seems that the dosimeter and charger were already designed for batteries shaped like the V40H, the narrow end is the positive and the wider end is the negative.

[@ChernobylFamily]

Thank you for sharing!

[@thomasfx3190]

That is a huge cat, sleep with one eye open! Great video as usual! 🫡😎

[@ChernobylFamily]

I NEVER SLEEP.

[@thomasfx3190]

@@ChernobylFamily HA HA! That’s good, well really that’s not very good, you should talk to someone about that.

[@jameslaidler2152]

Yakov Smirnov would still agree that like in the West, "you no own cat, cat owns you!"

[@ChernobylFamily]

Meow

[@wdavem]

Very interesting device. Looks like a pager. Makes sense. Your cat has decided your people-thing is in the way... Yet you put it back! It will now be reclaimed and displaced more intently each time, up to total destruction. Your warning level is now 'tail-3, kick-a-foot'

[@ChernobylFamily]

What is really good, that it takes a little space and does not require to look at it all the time. So as a basic warning device it is very useful. That was about cat. Now about dosimeter: cool thing indeed!

[@abandoninplace2751]

Vitruvian man tiny radioactive jerrycan. Oh wait, it's a dosimeter.

[@MrEdwinHubble]

Interesting that how much electronics have evolved... Nowadays you can even fit a SiPM with a scintillation crystal plus low power screen in such a small space... Nevertheless, this small device is phenomenal if you place it in that era: 400V DC supply from two coin cells is not a small feat in such small space. I wonder if they use the back EMF of the transformer primary to create a higher voltage for the piezo buzzer...

[@ChernobylFamily]

And still very useful!

[@_42_]

There is no piezo buzzer used. The transformer itself makes sound!

[@Xoferif]

Interesting to see those Soviet transistors! I'd assumed they were some sort of polyester capacitor or similar when I saw them installed on the circuit board.

[@ChernobylFamily]

Those are in very unusual casings. There is only one another type of transistor they made in those case, KT361. All the rest looked pretty usual, but those two... well, they are special :)

[@Muonium1]

Very interesting. The circuit construction is surprisingly primitive for something designed in the early 90s and resembles hand soldered consumer circuitry from the 60s in the West. It's possible this may be less to do with the expected inferiority of (immediate post) Soviet era electronics though and more a consequence of the very low production numbers for such a device. I wonder what the price was.

[@ChernobylFamily]

That is because it is early private production, basically from leftovers of 'mother' state factory.

[@Imzadi007]

Man, I love your cat 😆😆😆

[@ChernobylFamily]

It is purrrrfect!

[@jeremiahrex]

Those transistors are so cool! I first thought they were European style capacitors. Though everything being the same makes engineering easier and cheaper, it's nice to see something different. The flat pins do look like a pain though, I'd leave those in the past!

[@ChernobylFamily]

Those KT315 have quite unique casing, the only other type which has the same is KT361. All other types look usual.

[@zaprodk]

Cute assistant :)

[@ChernobylFamily]

The best!

[@IrenESorius]

Some small tigers reeeeeally love dosiometers,, 💖😻💖

[@ChernobylFamily]

He is our little engineer.

[@IrenESorius]

@@ChernobylFamily 👍‍‍🥰👍‍‍

[@phildem414]

Nifty little thing!

[@ChernobylFamily]

And very useful.

[@professionalvr]

This detector wouldn't look too out of place as an item in S.T.A.L.K.E.R. It could be a cheap detector for rookie stalkers.

[@ChernobylFamily]

That is an interesting point!

[@TheFanOrTheMask]

cheeky cat.

[@ChernobylFamily]

Meow

[@laurenthuw1104]

Merci pour cette super video !

[@ChernobylFamily]

:)

[@gabrielbarudi1399]

Very cute kissa!❤❤❤

[@ChernobylFamily]

Meow!

[@tedstrikertwa800]

Cool piece of history

[@ChernobylFamily]

Indeed it is. Thank you!

[@movax20h]

Fascinating. The transistor packages are also very interesting. Never seen something like that. And I didn't know tubes so small were possible and existed, but now I know, and should have been pretty obvious. I wonder what was the price of this thing.

[@zlatkobeljan4048]

nice cat

[@ChernobylFamily]

Thank you

[@jimmymiller77]

We can see who steals the show at the end. The real star.... K I T T Y .... What a fantastic channel you have. One if the very best. Best wishes from the U.S. Jim

[@ChernobylFamily]

I guess we will need to make a Fuzik special episode, as - just saying - there is 22 minutes long raw unedited fragment of that welcome, as he has been doing all kind of things :)))

[@KarinaMilne]

⁠@@ChernobylFamily absolutely would be keen for Fuzik to get his own antics video!

[@mrgeeknesss]

putting in the "not great, not terrible" quote 😂

[@ChernobylFamily]

))))

[@davegsm82]

@ChernobylFamily - I have a Biri and there are indeed compatible rechargeable cells available, the varta 1/V65HT is Nickel-Metal hydride, and is the correct size to fit, they are usually found in PCB mount format so you will have to snap off the terminals but otherwise they fit perfectly. Incidentally, there isn't actually a sounder/speaker inside, the sound is actually generated by the transformer, that's also why you can hear it ticking when it is operating normally. The small brass spring on top of the transformer effectively changes the tone of the sound, if you screw it in it gets higher, loosen it and it gets lower. I used to carry my BIRI on a keychain but it started to get damaged so removed it, I wanted to put it into a new case but they are really expensive now!

[@ChernobylFamily]

Oh my god. This is an unexpected turn. Thank you!

[@matusekpetr7806]

Super, díky za další parádní video ! Bylo by fajn, někdy udělat video o ID11, jelikož ty pokud vím, nosili lidi po městě v době jeho vyklízení. 🙂

[@Damien.D]

Yeah it's an obvious idea to carry such a device everywhere. Counts faster : go back where you come from . No surprises modern equivalent exists (this giger-watch is beautiful, who makes it? ). It's also well built and well miniaturized, impressive for 1991! (The cat is well built too, but not miniaturized at all)

[@intel386DX]

What inside the battery charger? Very strange that there are no long rechargeable of this standard.

[@ChernobylFamily]

I did not disassemble it, because it looks it will get broken completely if I do it. I guess there is a transformer and and a few more parts, as it is a very very small. Those cells were some Soviet-only thing, they look as button batteries, but are thicker and have a bezel around. Google "д-0,06" or "д-0,1", to see the images..

[@intel386DX]

@@ChernobylFamily i think that inside is only a diode and a resistors and ceramic cap. I remember one old 9V charger for socialist Bulgaria it has no transformer at all, but those mentioned parts.

[@ChernobylFamily]

May be, may be...

[@brunoramey50]

Nice cat video ! I don't know why it is interrupts with a talking guy. I just want to see the cat doing cat's things 😂🐱

[@ChernobylFamily]

Sorry about that

[@ALPHONSE2501]

Does this keychain dosimeter can be replica with modern electronic parts?

[@ChernobylFamily]

Highly possible, though the detector you need will be still SBM-10. The main trouble is that transformer. Totally handmade.

[@mfbfreak]

@@ChernobylFamily I would recommend building one with a solid state sensor. A PIN diode can function as a gamma ray detector. Combine it with a scintillation crystal for higher sensitivity.

[@ChernobylFamily]

@mfbfreak sounds very good. Though with scintillator IMHO size does matter, but here if the question is just to get LED blinking even small would work.

[@RC-nq7mg]

I see Chernobyl cats are the same as the rest! Regarding dosimeters I have a soviet DKP-50A. (I think the same model you put on your reproduction robot) Thankfully the seller in Ukraine charged it to 0 рентген since I do not have a charger. Would like to get a complete set. ps I also caught your "not great not terrible" refernce. Made me chuckle.

[@ChernobylFamily]

This cat we got from a trash bin near the Zone's checkpoint, in November four years ago... he was still a very little kitten and was nearly frozen to dеath, so it took some effort to make him ok. And now this grew out :) On the robot there are a bit different ones - ID-1, they are smaller. Somehow we did not have a good luck to get a functional DKP-50-A, seemingly capacitors in them are not as good as in ID-1.

[@silverismoney]

i want a usb-c geiger tube man. someone should do it. turn your phone into a dosimeter.

[@ChernobylFamily]

From our practice, if there is a connector to a detection unit, it better be rugged. USB is too gentle. But the thing you are talking about exists already I think 10 years at least, but with a bluetooth connection. It is called Gamma Sapiens, made by Ecotest company I mentioned in the video - ecotestgroup.com/products/gamma-sapiens/ and what is good, it also makes a GPS mapping of levels logged which is a VERY handy feature when you make surveys.

[@JeSuisUnePatate]

"Obligatory cat performance" 🤣🤣

[@ChernobylFamily]

Yess))

[@fazergazer]

Does the dosimeter respond to OCE rays? OCE = Orange Cat Energy 🎉

[@ChernobylFamily]

Also to CFP (cat food particles). Measured in cfp * sq. cm / min.

[@dvsur]

Saveitforparts Instruction

[@Stealth86651]

Needs more cat content

[@ChernobylFamily]

SOON! :)

[@Tim_de_Vries]

When does a new video come out?

[@josephking6515]

That was quite an incredible device for the time being so compact. I think your cat needs to show some respect for that or did he think it was a mouse. 🤔

[@ChernobylFamily]

When cats do this, this means they like it :) the device is very good, we use it on a daily basis.

[@raymondleggs5508]

400V from such a tiny transformer? Interesting little device with a paranoia inducing purpose

[@ChernobylFamily]

Not sure how much amps, though..

[@RynaxAlien]

Reliable and durable? How it compares in performace and sentivity to Radiacode 102/103 or Measall kc761?

[@ChernobylFamily]

Of course it is not as good (do not forget it is very old), but as a companion tool to my Stora-TU in the conditions of the Chernobyl Zone it already proved to be quite versatile. Once more, for my specific needs.

[@LolTollhurst]

It tops out at 3 röntgen. I mean, it's not terrible

[@ChernobylFamily]

milliRoentgen :)

[@_42_]

I have exactly the same one, but in it the radiation sensor is broken. Such a one is very difficult to find.

[@ChernobylFamily]

True.

[@Dreg0]

Кажуть Чорнобильські коти розміром з корову, а корова розміром з сарай. Коли чекати огляд на автентичного кота???

[@ChernobylFamily]

Після мишей. Господи, то буде хвилюючий досвід.

[@Atmatan]

I want one..

[@AllonKirtchik]

A question about the battery: I have some experience with cameras and light meters from the 1990s and older, and some of them require discontinued mercury batteries (РЦ in the USSR) not just for the nominal voltage, but for the specific voltage dropoff and resistance values that 1.5V alkaline batteries don’t match Can this device also be like that? If so, wrong chemistry batteries can throw off the calibration

[@ChernobylFamily]

Might be. To answer properly, we need technical specifications (that document with id СДИЖ.332564.000ТУ marked on the box) to see, but so far we do not have access to it. However, thinking logically, as it is just an indicator, there is not much precise calibration needed, and actually I wonder if there is a way to calibrate it at all.

[@AllonKirtchik]

@@ChernobylFamily Fair enough, for a device whose "readout" is just a "Too High!" indication, precision isn't really needed

[@kotnapromke]

Радиокот101 самый компактный прибор, с экранчиком.

[@ChernobylFamily]

Here we have a radiocat with vibration!

[@romanbohdanov6644]

Я бачив принципову схему подібного радіоаматорського індикатора радіації у журналі/книзі "В помошь радиолюбителю", за 1984 чи 1985-й рік(!) I saw a schematic diagram of a similar radio amateur radiation indicator in the magazine/book "Helping the radio amateur", from 1984 or 1985(!)...

[@ChernobylFamily]

Wow!

[@bang7bang]

this cat 😆😄😀🤣😂😊

[@ChernobylFamily]

Meow

[@РоманПолоз]

Прикольно, шкода, що воно потрібне саме через Чорнобиль, але класно, що прогрес не стоїть на місці.

[@ChernobylFamily]

Ну чому ж тільки, є купа потенційеих небезпек і без Чорнобиля - хоча б ті ж "радієві" годинники з 60-х... але так, криза - завжди поштовх для прогресу.

[@Kapplerartbloomingdale]

I want one

[@ChernobylFamily]

Sometimes thay appear on sale.

[@SryImMinimal0815]

the cat has to be a fix component of your videos....

[@ChernobylFamily]

He is the producer of this channel, actually

[@dvsur]

Sheekoz family

[@FunkyFlo]

HELLO! Plese tell us something ( or make video about) : The Big RADAR SITE near Chernobyl , which was called WOODPECKER RADAR, which could be heard on the shortwave radio bands worldwide

[@ChernobylFamily]

This year will come a big documentary about it. We know the place very well, I mean, really well, but the story has to be properly told.

[@FunkyFlo]

@@ChernobylFamily OK, cool! Thank You !! 🙂

[@MMLGuillemain]

It’s not 3 milliroentgens, it’s 15 millions.

[@ChernobylFamily]

I will tell you something - though I got the joke... when you see on your device 100 milliroentgens... it is the feeling. Like, 'this is it, pay some respect to it, it is not a joke already". I mean... if I would see 15M... I cannot even imagine. That might be really scary.

[@traumgeist]

Kitty hates Soviet dosimeter.

[@ChernobylFamily]

Hates? I guess you are not very knowledgeable in a cat behavior then ;) Not really Soviet, btw.

[@mwk1]

o kotek

[@ChernobylFamily]

Mnau

[@jantepas7511]

Can you take an x-ray? So you can see a beeper….

[@ChernobylFamily]

That would be too short exposure. Therefore to test it in Pripyat, as pictured, was more effective.

[@durango8882]

Ok I will be the person who thinks it’s 👎🏻but a more expensive device will possibly save your life. When it comes to your safety…spend the extra few bucks🤜🏻✌🏼🙀

[@ChernobylFamily]

I agree that it is insufficient per se, but here comes a practical experience: permanently screaming dosimeter is a thing you stop to hear. So why I like this - it gives a signal once per time. Actually, a big difference.

[@durango8882]

@@ChernobylFamilyOk I will respect your expertise. Thank you 👊🏼

[@wilsonj4705]

Cat in video = 50% more likes

[@ChernobylFamily]

Mnau

[@shkiper4224]

This thing have the saddest beep i ever heard.

[@ChernobylFamily]

One guy in comments explained an interesting detail. I was wrong, there is no beeper. The sound is being made by that transformer, so this is why it sounds so. Besides, I guess the device which was in the box unused for 30+ years is in a bit shock to wake up in XXI century and cannot get its emotions in place :))

[@joshcarter-com]

Came for the cat, stayed for the neighborhood trek to scan radioactive debris.

[@ChernobylFamily]

Meow

[@MiamiMillionaire]

A interesting device, I would definitely hang it on my key chain 👍

[@ChernobylFamily]

You should! They appear on sale regularly!

[@cryptearth]

cat does what cat has to do: can't throw it of the table? at least knock it over things only cat owners understand - part #321654978

[@ChernobylFamily]

Meow.