1940 X Ray Physics Documentary By William D Coolidge

[TheKcsmithy]

interesting video and very informative

[jayejayeee]

good work here

[thegeffc]

i enjoyed this vid

[distractionxx]

love the video really good

[jjjeahh]

lol I'm using this to make vocal samples for dubstep.

[0000794]

<3 it !!

[SeniorThe12]

7:03 AN IPAD??!!!!!!!WHHAAAT?

[buddhafollower]

liars! the eniac was invented by the germans. they said that it has been built by mauchly and eckert, but that s not true. and also, i would not be surprised to find out that they had faked the inventor of hot cathode x ray tube also.

[MrSawler]

Pouce vert pour tous ceux qui regardent cette vidéo à cause d'un exo dans le livre de Physique-Chimie !

[ffxikentaru]

recordinational DE-VISE!

[EXO903]

thumbs up if you saw the hole film

[raz07basnet]

why the x-rays don't penetrate the bones but easily penetrate the muscles or flesh

[ooaremu]

@raz07basnet your bones are alot more dense thatn you muscle and flesh.. what you see in an X-ray is the change in density picture.

[RespectMyHate]

how dangerous are x rays?

[Op3rationMongoose]

@RespectMyHate the intensity and duration of x-rays used in medical practice aren't significant, provided you aren't being exposed to them every day. Chest x-rays and CT scans are the most powerful radiographs, in terms of dosage. But they're still quite safe. Everyone has an annual dose limit, it's an international standard.

[RespectMyHate]

@Op3rationMongoose Thanks that makes me feel better.

[USFullOfLies]

@RespectMyHate

radioactivity.

[jonahansen]

I guess he wasn't too concerned about his exposure to ionizing radiation, the way he stuck his hand in there.

[katt2002]

@jonahansen

people of that era were still not aware of the hazards and effects of radioactivity to human.

[ParaglidingManiac]

brilliant minds.

[Miyokorika]

Yes sir, we run 25Mv for a long period since we do energy and profile scans. Its over 81% slope (10 cm depth water, 10 by 10cm field size at 100cm. On Mevatron machines it uses a gold carbide target and this becomes radioactive (when running above 15Mv) for a certain period that we add an aluminum (10mm thick) absorber when this energy is selected. We can smell the ozone in the head (like a burning sugar) just after running 25Mv.

[thedjtwilight]

Ayinozendy, the negative effects of radiation were discovered within 9 years of their discovery by Thomas Edison. He was the first inventor to develop fluoroscopy, and he experimented on his assistant, a man named Clarence Daly.

Because the effects of radiation take time to reveal themselves, Clarence's condition was a forgone conclusion by the time his "burns" surfaced. These eventually turned cancerous, and he had to have his entire arm removed, and died shortly there after from the gross r

[ayinozendy]

I didn't hear him talk about the effects of the X-ray on health. Is it that health effects have not been discovered/studied on that time, or maybe it was discovered but not made public? I need enlightenment please...

[usernamethatsallmine]

thanks for the upload! i'm just started the seconed year of my studyes as a radiographer, seeing this just made my day! :D

[stupidkids911]

random penis cancer!!!!!

[sz42781]

knee cancer

[sz42781]

I love science

[ickyickyyaya2000]

Speeded up...I guess that's why the ENG in engineering stands for "English No Good" haha

[N10ZT]

Beautiful. Thanks for posting!

[hossamrida]

Great Video! Extremely helpful

Thanks for posting

[drsZoidberg]

пипец, как мужик там себя облучает на камере!

[FirstHumanimalien]

thank you for posting

[minhnhat1322007]

X-Ray shortest wavelengths depends on the effective voltage or maximum voltage

[minhnhat1322007]

X-Ray wavelengths depends on the effective voltage or maximum voltage

[minhnhat1322007]

is High voltage between Anode and Katode DC or AC?

[Sixalienasa]

@minhnhat1322007 Its AC/DC

[hossamrida]

@minhnhat1322007 DC, so that the cathode stays a cathode and not turn into an anode when the ac changes the direction of current :)

[mdh9836]

I am married to the great grand daughter of William Coolidge. It is wonderful to actually see him "in the flesh." Thanks to whomever posted this. Do you know, are there more?

[fishcake1235]

Good video thanks for posting

[PAM2167]

Left out the fact that long term exposure to x-rays can lead to radiation poisioning and death. in the 1940's do you know how much of a dose of radiation you got from one of Those tubes?

[apedas]

@PAM2167 the x-rays surely has saved most lives and surely has improved the quality of life

[brianmenendez]

thanks for posting and thanks youtube for making postings like this available

[DrMotorDude]

@leotakesleo Roentgen is shown at the beginning of the video, pay attention instead of calling people 'moron.'

[5PlayMakerz]

Great Man

[peugteobike]

great video

[radiation500]

I understand that a simple Tesla coil can produce x-rays when the high voltage stream of electrons is directed at a metallic target, like tungsten or iron. Anyone have any info on this?

[sundaymorning03]

this is cool for a rad tech student like me...

hahahaha,,...cool

[femtophysiker]

Is this some sort of a language? Well anyway, I at least didn't understand what you want to tell!

[sombreroboom]

*round of aplause*

[KarbineKyle]

Awesome! So Much Was Discovered Back In Those Days, Before Those Times, People Believed It To Be Impossible! Absolute Genius! Röntgen & Coolidge, You Have Shown The World, Beyond Visible Light! You Shall Be Remembered! You Are Geniuses! Excellent Video! 10+!

[geramtec]

I love x-rays. Now I worked on machines with the target in air and not angled no more and the beam just goes straight.

I love photons and electrons. I love gamma as well, what else and the smell of ozone in the collimator like a burning sugar when I ran beam at 25 Mv for a long period.

[leftyelysium]

@geramtec Where are you running 25Mev for long periods of time? That's alot of penetration.

[boxa888]

tesla was second in line!,not collidge, look up teslas xray book. tesla really discovered the xrays before rotegen,he called them dark rays, but didnt realize the importance yet. once rotegen saw they were able to penetrate material, tesla went back to work with the tubes he already made before rotegen and even sayes it as a joke in his xray notes that he didnt realize the rays. this same xray book also shows the first industrial xray tube used till this day,he also gives expose times and safety

[boxa888]

3 40! tesla clearly shows this and explain this in his xray notes about 25 yrs before this guy, the focal spot,cup shapped target, even the priciples of its working.please look it up and understand this! tesla was a major medical contributor but of course he was not talked about at all in any of these old videos, its truely sad.

[jandjfilms4]

Tesla was indeed great and overlooked, but he did not invent the tungsten filament. Coolidge worked out how to draw out tungsten into a thin wire to make filaments while working for GE. They patented the technology and made a fortune for the duration of the patent. They charged such a high price that european manufactured tubes were smuggled into the US over the canadian border.

[boxa888]

have you read teslas xray notes, he experimented with target sources to produce xrays in powerful strength, he used many metals and materials to produce xrays and the tubes collidge are showing are the same tesla made, its sad poor tesla, ok soo he didnt make the tungsten fillament but he did show how matter reacts as a wall for xray production and safety. alls im saying is that tesla did discover xrays before rotengen(dark rays) and that tesla was first or second in the production of xrays.

[boxa888]

yet tesla is not even mentioned in the history of the xrays its really sad! if not first tesla was second and gave the safety mechannisms so you dont die or get cancer, tesla never died of radiation poisoning in any way, rotegen killed his wife by making here get cancer, dont you see the importance of teslas work??!!!

[Nicholasdude187]

@boxa888 No offence your english is so bad I could barly understand you.

[Redstriker1]

ok thank you so much im not bothered anymore... sunday morning i got my first x-ray and monday afternoon i got the second one... thank you so much...

[NewtonParadox]

Fact x rays cant pass through glass!!!!!

[redmilkcrate]

Yes they can. They are generated inside a glass tube for fuck sake.

[Redstriker1]

Please read....

someone can help me please. getting 2 x-ray exam within 24 hrs is dangerous? because i got 2 chest x-rays within 24 hours...

[upsilone]

lol. 2 X rays are not dangerous.

It's not the number of xrays you get a day that are dangerous, but rather your time under exposure.

If you stay for 5 minutes under xray radiation, then yeah, that becomes bad.

However, if you stay only half a second each time (which with 2 gives you about 1 second of exposure), your risk is very minimal.

[redmilkcrate]

Not at all 1 chest x-ray is approxomately equivalent to 1 day exposure to background radiation. The dose from 2 chest x-rays is like the increase in exposure gained from flying from Manilla to San Francisco at high altitude.

The radiographer hides behind a screen because they perform these examinations about 40 to 50 times per day every working day - which becomes a bit risky.

Cancers are known as stochastic risks and are entirely down to chance. But are rare.

[EvilbobSC]

Hell Yeah a portable x-ray machine A screen that shows motion of the bones in real time... This mofo is pimp I want to learn how to make from scratch like he did... Yes Please!

[xrayrep]

This mofo is pimp??? What the heck does that mean? Anyhow, if you want to build an X-ray machine you will first have to learn electronics, Physics, Math, and a few other esoteric disciplines, as well as safety procedures. Are you up to the challenge?

Okay, now please explain what mofo pimp means. Thanks

[EvilbobSC]

"This mofo is pimp" = Slang for "He did a great presentation" As for building it. . .  What one entity can do. . . Another entity can do.

And Yes I am up to the challenge and then some. . .

Although I am not at liberty to disclose at present

(b'_')b

[redmilkcrate]

It's a glass cathode ray tube with a tungsten source cathode (+ charged), and a tungsten (10% carbon) anode (- charged). You can make one of them easily. So long as you can create the vaccuum. The x-rays come flying off in all directions when energised. Use about 70kV (this is the optimum voltage for liberating tungsten electrons) and about 4 millieamperes per second (mAs) to produce a tidy quntity of radiation.

[jandjfilms4]

cathode is -ve charged, anode is +ve

[stephenharperbest2]

A so called "mofo" is a street slang used by gangs to symbolize a swear word in short form. Now a "pimp" is also a street slang that means a person that commits adultery.

[ajbetts]

fluoroscopys not as strong as conventional xrays! so its not as damaging....they use it in many operations.

[boxa888]

wow thats amazing he puts his hand and knee through the beam, i thought xrays are dangerous, put hes putting a long dose through his body parts, thats crazy.

[determined2run]

This is awesome, I'm a radiology instructor and would love to show this...too bad You Tube is blocked at work.

[Cyberphysics]

Thankyou for posting this. It adds another dimension to my teaching of the subject...

[geramtec]

You could try "Home made X-ray". It shows a basic setup that emitted actual x-rays and was done at home.