View Single Post
Old 17th Jul 2020, 6:56 pm   #64
Malcolm G6ANZ
Octode
 
Malcolm G6ANZ's Avatar
 
Join Date: Feb 2006
Location: Bristol, UK.
Posts: 1,030
Default Re: DIY X-Ray & Auto Jigger transmitter

The linacs I worked with produced 6Mv x-rays. All around the head was lead shielding to try and protect the semiconductors .It helped that the majority of the x rays went forward from the target so only back-scatter was present.
The board didn't fail in a spectacular manner but gradually stopped working correctly. One set of boards had to demultiplex and drive 40 motors to millimetric position. When new they worked perfectly but as they got damaged the complete bank of motors would start to drift with no command signal. We put this down to the darlington drivers becoming leaky.
The linac head tries to show the amount of electronics surrounding the head. The target for the x rays is just in front of the brown disc. The disc is a thin 'window' to allow electrons to pass if electron therapy is used.
Attached Thumbnails
Click image for larger version

Name:	Linac head.JPG
Views:	105
Size:	117.3 KB
ID:	211202   Click image for larger version

Name:	Linac target.JPG
Views:	108
Size:	112.4 KB
ID:	211203  
Malcolm G6ANZ is online now