Fun with CRTs

4 of our cathode ray tubes showing some of their unique properties. The first just shows the electron beam across a phosphor being bent by a magnet. The 'Maltese Cross Tube' has a metal cross as a barrier indicating the path of travel of the electron beam. The paddlewheel tube demonstrates the momentum carried by electrons as they strike the vanes and cause the wheel to spin. Lastly, the x-ray tube is pointed towards a plush bear with a copper wire skeleton.

Category:

Science & Technology

Tags:

• Cathode
• Anode
• Maltese
• Cross
• x-rays
• paddlewheel
• roentgen
• CRT
• electron
• beam

[739199]

How did you capture the xray photo and if it was in the videos audio, sorry I'm deaf

[BerkeleyLectureDemos]

@739199 The X-ray tube is aimed at a phosphor that lights up when hit by the beam. Since it doesn't penetrate metal, we can see the shadow of the bear's skeleton which is made of copper.

[nexx1011]

mmmm... x-rays....

[pantyflash]

Like, so awesome I can barely relate. Totally tubular, babe!

[willbirful]

interesting video and very informative

[gabriellando]

What's the voltage on the terminal so that the electrons are really able to push an object away?

[Mas7erChief117]

@ChumpusRex sooo i didnt get dosed? great :D lol

[ChumpusRex]

@Mas7erChief117 X-rays are generated when a high speed electron (e.g. accelerated by 20,000 volts) comes to a stop by slamming into a target (e.g. front of the screen). The energy of the rays (how penetrating they are) depends on the voltage. More volts - more penetration. To protect the user, the CRT tube is made of lead glass (that's why they are so heavy - and so toxic for the environment). Normally virtually no rays escape, but if the voltage is set too high, they could penetrate the tube.

[MadScientist1011]

how did you construct this tube?

[heroineworshipper]

Surprised electron beams aren't used for beamed propulsion between satellites in space. Must not be very focused.

[OnnomonnomonnO]

1:31 - LMAO :D:D:D

[Mas7erChief117]

@BerkeleyLectureDemos so I took apart an old iMac with a CRT screen, there was an x-ray warning, do they actually emit x-rays or only when they are on or something, just asking.

[AcapulcoRenard]

Nice stuff!!

[Zsakf0s]

I hadn't thought teddy bear has bones....:)