Author Topic: First of two dental x-ray generators  (Read 412 times)

Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 319
  • Karma: +7/-0
    • View Profile
First of two dental x-ray generators
« on: May 05, 2020, 07:15:21 AM »
A week before Covid lockdown, a local dentist was moving to a new office.  He didn't have to move his oldest x-ray machine, because I took it off his hands.

The control box reflects my interests and image. It includes a switch-selectable autotransformer, timer, and long curly cord with remote-control button. Output had been wired to an ordinary wall outlet into which the X-ray head was plugged.

Wires were cut and plugs were removed to get the machine home.  Control box wires were restored a couple weeks ago, and tested by turning on a desk lamp for selected short intervals and selected brightness.  Then X-ray head joined the party, not to make radiographs but to measure the expected bursts of ionizing radiation.

It worked on the first try, and the next 10, all with me about 20 feet away, before all four 200 mR pen dosimeters were near full scale.

Note well: if timer and dosimeters are accurate, the point-blank intensity was around 300 to 500 R/hr.  A seriously scary level if seen on a regular Civil Defense meter.

These systems have a mechanical hazard which could be lethal if overlooked. The manipulator pantograph, like many adjustable drafting tables and garage door openers, includes strong springs instead of counterweights. Unless restrained, a linkage can clobber you unexpectedly when a load is removed, or a brake or clamp is released.
Springs can beat high voltage capacitors, when it comes to storing energy for years with no loss.

Offline klugesmith

  • High Voltage Engineer
  • ****
  • Posts: 319
  • Karma: +7/-0
    • View Profile
Re: First of two dental x-ray generators
« Reply #1 on: October 29, 2020, 06:17:31 AM »
Finally used that thing to make a couple of radiographs.  My fluorescent screens are lost in clutter, and wet film developing too much trouble.  So I ordered some self-developing dental film packets, with a standard size about 31 x 41 mm.  Started with exposure tests using some well-defined phantoms arranged on a piece of sticky tape in a frame.  1 to 5 layers of 4 oz copper foil, and 1 or 2 layers of round aluminum wire (avoiding aluminum alloys).  Some radiolucent objects like a thickness wedge of aluminum foil and a thin Lego brick are barely detectable in the second image.
« Last Edit: October 29, 2020, 06:24:13 AM by klugesmith »

High Voltage Forum

Re: First of two dental x-ray generators
« Reply #1 on: October 29, 2020, 06:17:31 AM »

 


* Recent Topics and Posts

post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
Today at 09:41:14 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
bogdan
Today at 11:38:28 AM
post Re: Simple H-Bridge construction with low parasitic inductances (for SSTC or ...)
[Beginners]
davekni
Today at 02:55:51 AM
post Re: Next Gen DRSSTC
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Intra
December 04, 2020, 08:03:04 PM
post Re: AGFA ADC 5155 X-ray Scanner Teardown (4 part series)
[X-ray]
Mads Barnkob
December 04, 2020, 06:54:06 PM
post Re: Simple H-Bridge construction with low parasitic inductances (for SSTC or ...)
[Beginners]
Da_Stier
December 04, 2020, 04:42:50 PM
post Re: 2017 tour of Arecibo Radio Telescope and RF equipment
[Radio Frequency]
Da_Stier
December 04, 2020, 04:39:58 PM
post [ebay EU] good offer on 1000uF 300V Epcos electrolytic caps
[Sell / Buy / Trade]
Da_Stier
December 04, 2020, 04:28:00 PM
post Re: Ericsson RRUS 11 B4 teardown
[Radio Frequency]
Da_Stier
December 04, 2020, 04:22:38 PM
post 2017 tour of Arecibo Radio Telescope and RF equipment
[Radio Frequency]
station240
December 04, 2020, 04:16:26 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
davekni
December 03, 2020, 06:58:09 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
panjaksli
December 03, 2020, 03:28:56 PM
post Re: steam engine
[Capacitor Banks]
plasma
December 03, 2020, 01:12:03 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
bogdan
December 03, 2020, 12:05:36 PM
post Re: Single mosfet driving with GDT
[Solid State Tesla Coils (SSTC)]
costas_p
December 03, 2020, 10:55:08 AM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
panjaksli
December 02, 2020, 08:57:34 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 02, 2020, 08:17:09 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
davekni
December 02, 2020, 08:12:55 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
panjaksli
December 02, 2020, 07:34:53 PM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 02, 2020, 07:14:18 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 02, 2020, 07:05:18 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
panjaksli
December 02, 2020, 06:58:40 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Max
December 02, 2020, 06:56:50 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
profdc9
December 02, 2020, 06:20:35 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
panjaksli
December 02, 2020, 05:24:23 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
buchtawill
December 02, 2020, 03:25:59 PM
post Re: Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
panjaksli
December 02, 2020, 03:02:01 PM
post Have you ever tripped a breaker during normal operation ?
[Dual Resonant Solid State Tesla coils (DRSSTC)]
panjaksli
December 02, 2020, 01:36:04 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
bogdan
December 02, 2020, 08:55:06 AM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
johnf
December 02, 2020, 07:43:14 AM
post Re: How to design FPGA based on EDA technology?
[Electronic Circuits]
Genterman
December 02, 2020, 06:53:52 AM
post Re: DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 02, 2020, 03:29:14 AM
post Re: DRSSTC trouble
[Dual Resonant Solid State Tesla coils (DRSSTC)]
buchtawill
December 02, 2020, 02:43:33 AM
post Re: SKP DRSSTC = aliexpress driver + medium coil + large bricks ;)
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Maju
December 01, 2020, 10:44:31 PM
post Re: mini tesla (hopefully not a fail)
[Beginners]
davekni
December 01, 2020, 07:44:14 PM
post Re: transistor markings question
[Beginners]
davekni
December 01, 2020, 07:39:48 PM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
December 01, 2020, 07:38:53 PM
post Re: How to design FPGA based on EDA technology?
[Electronic Circuits]
petespaco
December 01, 2020, 06:30:33 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
December 01, 2020, 04:58:29 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
December 01, 2020, 04:22:10 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
December 01, 2020, 03:02:51 PM
post Re: Half-brigde with pot on mosfet gates question
[Solid State Tesla Coils (SSTC)]
TMaxElectronics
December 01, 2020, 12:08:56 PM
post transistor markings question
[Beginners]
NOOBPASTE51
December 01, 2020, 12:02:19 PM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
December 01, 2020, 11:55:01 AM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
TMaxElectronics
December 01, 2020, 11:50:19 AM
post Re: Analog HFBR amplifier
[Electronic Circuits]
TMaxElectronics
December 01, 2020, 11:21:56 AM
post Half-brigde with pot on mosfet gates question
[Solid State Tesla Coils (SSTC)]
costas_p
December 01, 2020, 11:17:16 AM
post Re: Question about arduino polyphonic MIDI interrupter
[Dual Resonant Solid State Tesla coils (DRSSTC)]
bozidar
December 01, 2020, 11:11:50 AM
post Re: mini tesla (hopefully not a fail)
[Beginners]
bogdan
December 01, 2020, 09:29:24 AM
post Re: HF Litz wire as a primary coil
[Dual Resonant Solid State Tesla coils (DRSSTC)]
johnf
December 01, 2020, 07:03:56 AM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal