@Theoria Apophasis Hi, I recently got a Konica f/1.4 57mm and the glass has yellow tint on it. I'm not sure if it's radioactive or not. Some say the yellow tint could be due to the glue, while others day it's due to thorium doping. So I want to test if the lens is radioactive or not by myself. I'm planning to get a GMC 320+ detect if the lens is hot. This Geiger counter can only detect beta, gamma and x-rays. So is this enough to conduct my tests or would I need a device than can detect alpha rays as well? Please let me know. Thank you!!

@kathodosdotcom

3 жыл бұрын

a lot of those old Konica lenses ARE radioactive

@yesaswi92

3 жыл бұрын

@@kathodosdotcom Thank you. Also, is it enough to test it on a Geiger counter that can only detect beta, gamma and X-rays??

Ken is the only person I've seen to give real info on these lenses and suggest proper safety when handling. Plus, he also turned me onto the amazing Auto-Takumar 55mm f2, which is sharp as s$&t and NOT radioactive.

Gamma radiation turned Bruce Banner into the Hulk. Dangerous stuff.

Can objects stored near to these lenses get radioactive themselves, like by Thorium particles distributing on this object? e.g. can cameras which where equipped with these lenses get radioactive?

After watching this video Ken, I now keep my Takumar lens in a lead bag. You remember those film safe bags for going through airport security.

Do you know which lenses aren't radioactive? Cuz I was considering getting a Canon FD 50mm f1.4

@kathodosdotcom

6 жыл бұрын

that lens is not radioactive

Is there a list of radioactive lenses? How can one tell without buying a Geiger counter?

@michelangeloc.4265

3 жыл бұрын

@Essentialist yes no true. I have some old lens and only one is radio. Takumar 55mm 1.8. Using a Geiger Muller tells me no radiation from front and side. Radiation from back: yes Put in the camera with adapter , back of the camera no radiation. Regards

@VitoPastore

3 жыл бұрын

​@@michelangeloc.4265 ​ @Essentialist yes ​ @Smithian Paul I have 2 old teleconverters, one vivitar mc 2x-3 and a Rokunar mc7 7 element. I dont know how old are they but at least from the 80s and could be from 70s as well. I have be wondering about if they can have Thorium.

What is a safe distance for storage from your bed ???

@THX..1138

6 жыл бұрын

There is no such thing as safe exposure to radiation. Exposure is inversely proportional to the square of the distance from the source. Meaning , you will receive 4 times less radiation at 2 meters than you did at 1 meter. So the answer is store your lens (preferably in a metal box) as far from you as is practical.

That's cool. In video I hear more fissions than my meter gave when placed on rock of natural uranium. Hopefully mine is just not properly sensitive. edit: What I hear in the video seems to be quite close to what my meter sounds like when places near self-luminating rifle sights.

Can you give a test about Carl Zeiss tessar lens please?

if it's in my camera bag do I have to like put it in a lead case or will it not hurt my camera?

@kathodosdotcom

6 жыл бұрын

no, just dont leave it mounted on the camera for long periods, the rads can damage the chip or the processor

@BloodSprite-tan

6 жыл бұрын

can it damage the sensor on a mirrorless?

I dig the good old Geiger Counter and Radio Shack Amp Speaker . Vintage Atomic Age Coolness.. Now I Need a Lead Shield !!!

Kai Wong is always amusing. I wish he does "list of cheapest, good lens on the market", too.

can you link the article on Lost Secrets of the Golden Ratio & Ancient Greek Incommensurability?

@kathodosdotcom

6 жыл бұрын

its free on archive.org :)

@demoncore7275

6 жыл бұрын

no article about it or does it refer to another author?

So, how dangerous is it? Can you compare it to something - like x-ray?

@kathodosdotcom

6 жыл бұрын

dont lick it or store it near your crotch.

@THX..1138

6 жыл бұрын

Everything depends on how close you are to the lens, for how long and how radioactive the particular lens is. In general anything setting off a Geiger counter like you just saw if used regularly over a period of years is probably going to be like many x-rays. When compared to the many risk a person takes in their life the chances you'll ever be harmed by one of these lenses is pretty darn low, but seeing as for just about every one them there is a non radioactive equivalent lens out there is it worth taking the risk? For me the answer is no. The effects of radiation exposure are cumulative. I won't own a radioactive lens.

So what's the main takeaway from this? I ask because I just bought one and I stumbled upon this video - return it? use it with constant anxiety?

@kathodosdotcom

6 жыл бұрын

dont sleep with it and dont leave it ON your camera for long periods....the radiation can cook your electronics to failure

@iyoutome

6 жыл бұрын

Collect gama waves and power your house. JK but there has to be more to it.

@mccririck01

5 жыл бұрын

@@iyoutome How many do I need to power my kettle?

@iyoutome

5 жыл бұрын

@@mccririck01 that is a good question.

As a matter of fact, this is one of the few video I will abound in your way. Thorium is not only Th232, its also a lot of Isotopes that are also all radioactive, a thus have all a radioactive decay scheme. When you look at Th232 decay Scheme, there is a lot of Beta and Gamma emitter, especially at the end of the decay scheme, and most of them are in the range of High KeV or MeV for some So It's naturally emitting high energy gamma, but also High Energy Beta- which by Brehmstrallung will emit X-Ray in the same range of energy as the Beta- ray. It seems that there is also in the Thorium Isotopes some Beta+ emitters, that will the decay in 2 Antagonist Gamma of 511KeV energy. So Well done Ken, your demonstration was good :) Could you tell us what was the caliber you used on you Geiger counter, the model of the detector and last calibration date?

@mccririck01

5 жыл бұрын

Can you show us the gamma emitters? en.wikipedia.org/wiki/Decay_chain#Thorium_series

Mythbusters with Theoria Apophasis

Thanks for the info, I was just about to purchase that Super Takumar on Ebay, but after this video, hell no :D Until this point I was like "no way the radiation gets through the camera body", but seems like it makes almost no difference.

@kathodosdotcom

6 жыл бұрын

tons of BS info out there that its only emitting alpha radiation, but thats total BS....

@alan-veucasovic

6 жыл бұрын

Hey, you can still get the Super Takumar 50 8 element. Except to pay $100 or higher and no yellowing. Sharper in the center too. www.verybiglobo.com/50mm-f1-4-legacy-lenses-shootout-wide-open

@mccririck01

5 жыл бұрын

Just think, ebay sellers are posting these lenses all the time and the radiation is not going to be blocked by normal packaging!

Ahhh, good to know. Now my pictures will be much better.

does the old SUMMARIT LEICA are?? i polish them and inhaled glass dust.... ?? thank you. the color is not yellowish.

Would radio active lenses be safe to use for short periods of time? Also how do these lenses become radioactive in the first place?

@kathodosdotcom

6 жыл бұрын

the glass is doped with thorium. FACT QUOTE: The only naturally occurring isotope of thorium is 232Th and it is unstable and radioactive. ... In addition to the alpha or beta particles emitted as a result of the decay of a parent isotope, most of the daughter isotopes also emit gamma rays.

@mtndewv

6 жыл бұрын

So the glass is infused with thorium 232 when the lenses is being created?

@kathodosdotcom

6 жыл бұрын

yes

@mtndewv

6 жыл бұрын

Thanks for answer, it was probably easy enough to find the answer online but it's nice to get confirmation from someone who know what there talking about. 😃

@yesaswi92

3 жыл бұрын

@Theoria Apophasis Hi, I recently got a Konica f/1.4 57mm and the glass has yellow tint on it. I'm not sure if it's radioactive or not. Some say the yellow tint could be due to the glue, while others day it's due to thorium doping. So I want to test if the lens is radioactive or not by myself. I'm planning to get a GMC 320+ detect if the lens is hot. This Geiger counter can only detect beta, gamma and x-rays. So is this enough to conduct my tests or would I need a device than can detect alpha rays as well? Please let me know. Thank you!!

That 44-9 pancake *is* sensitive to alpha. It's a mica window pancake tube.

That's a lot of bananas

Thank you for this video

Hey, thanks for another epic science video! Here's a little secret people might not know, as it's not anything one can look up online, because nobody has ever tried it out: When the Geiger counter is reset to zero out the "background noise", it also might be zeroing out the sound of radon gas decaying which might be continually drifting out of the lens and then floating around in the air for 55 seconds, and then it fires two double-proton (Helium) atomic cannons in succession. Check out Thorium Cloud Chamber videos to see what these two-part explosions look like, which shows the V-shaped vapor trails. One way to test the lenses for radon emissions would be to put all the thoriated lenses into one room, leaving them out in the open air and shut the door, and then stir up the air a little and count the number of pops going on in that room vs how many the Geiger counter makes in the other room. If there are no exposed building materials containing sand or granite, like ceramic tile, bricks, or concrete, or any drafts coming from such like a chimney or from under the house, then there shouldn't be that many, if any, popping and crackling sounds coming out of the Geiger counter, just from holding it up in the air.

It was weaker only because of the increase in distance ?

@kathodosdotcom

6 жыл бұрын

FACT QUOTE: The only naturally occurring isotope of thorium is 232Th and it is unstable and radioactive. ... In addition to the alpha or beta particles emitted as a result of the decay of a parent isotope, most of the daughter isotopes also emit gamma rays.

@kathodosdotcom

6 жыл бұрын

kzread.info/dash/bejne/hIefqNOnc5vblbg.html

@kathodosdotcom

6 жыл бұрын

any dose of GAMMA is too damn much.

@robertvarner9200

6 жыл бұрын

Inverse square law.

if you play Kai vid again he say the radioactive element turns the coating yellow...he not say the coating is radioactive

@kathodosdotcom

6 жыл бұрын

wrong, listen again

It's awesome that you have a geiger counter. These guys wiki "Thorium" and overlook that many different isotopes of thorium are in a sample and they also assume that when wiki says "Decay mod = alpha" that it means ONLY alpha. That only makes that isotope primarily emits alphas. Some isotopes primarily emit beta btw like Th 231 and 234. You're 100% right, nothing ONLY emits one type of radiation. There's always a break down of the odds of each type of emission. In the make believe world were something only emitted alphas it would be invisible because it wouldn't emit light. Nothing is 100% stopped by a piece of paper, materials have a tenth thickness. Paper has holes in it. I'm not a fan of quantum tunneling theory but the result that alpha particles can move through materials even though they are too large to physically penetrate is recorded fact though it may just be one alpha replacing another and the second being emitted in the opposite direction. I digress, a certain thickness of paper will stop 90% of a given type of emission. Also a rabbit trail. Alpha particles have a +2 charge so they can pull electrons with them to stablize to a neutral charged helium ion and cause photoelectric effects in another atom which can cause other types of radiation as they are emitted. thorium can "spontaneously" fission (disagree with the term but it does fission unpredictably) and the products will emit beta decay, and neutrons that can cause multiple fission events.

Thorium 232 gives only 0,05 MeV as γ rays. It’s neither α nor γ, what you are indicating. It’s β, but not from Thorium; it’s radiating Ne 24 & 26 with about 54-56 MeV. Ne 26 has a half-life of 7ms giving you β- radiation of another 7 MeV. That is why the Geiger-Müller indicator goes ape shit. Thorium gives you in fact α radiation, but you also get β as a free gift.

@stevenstocking5855

6 жыл бұрын

ARS_Analog I was just about to say that! 😢😂😂😂

@mccririck01

5 жыл бұрын

Yeah, looking at the Thorium 232 decay series: en.wikipedia.org/wiki/Decay_chain#Thorium_series there are no gamma emitters there.

Here is a web page that answered a number of questions I had...www.rangefinderforum.com/forums/archive/index.php/t-150550.html

Take that Kai 😂

@kathodosdotcom

6 жыл бұрын

everyone makes mistakes, no big deal at all.

@josesavant

6 жыл бұрын

Theoria Apophasis Hope he would make a short video correcting that information, that would be awesome from his part 🤙

Its common sense Coatings Wear Off and after decades we would see it . Maybe people like to say the word Coating ?

@mike4ty4

5 жыл бұрын

I think it has to do more with the fact that the glass has that tint to it, and at least in modern lenses the tint you see comes from coatings applied thereto, and a not historically-minded camera user might be inclined to assume that the same holds for this from further back.

Hey ken

Clearly, he has demonstrated that the radiation detected from the lens is NOT alpha, but the pancake probe he's using likely DOES detect alpha (if above 3.5 meV).

Radioactive lenses are so much better, i will never again buy a lens without radioactivity !!!!!

I guess these lenses must have fogged film. Not such a good idea!

@eustacequinlank7418

6 жыл бұрын

Did they fog the film for the people using them at the time they were manufactured? I have the Mamiya / Sekor 55mm F 1.4 and Helios 44-2 and they've never fogged film. To be honest, even though they are yellowed and listed as potentially being radioactive, I've never waved a geiger counter over them, so they may or may not be Thoriated glass for I know. My face gets turns a bit green and becomes hella itchy when I use them though...

@77appyi

6 жыл бұрын

gilbet ....have your hard of David banner ???

@gilbet

6 жыл бұрын

Yeah, it sounded like it might be a joke, but "itchy" made it sound like a real ailment. Maybe he's allergic to seafood, and so using the lens was like holding a conch shell to your ear or something.

@eustacequinlank7418

6 жыл бұрын

"using the lens was like holding a conch shell to your ear or something." Doesn't everyone do this? How else to I obtain superior bubble bokeh?