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Electronics => Projects, Designs, and Technical Stuff => Topic started by: oz2cpu on March 22, 2022, 09:42:49 pm

Title: X-ray detector Philips PW1965/20 DY1787 Geiger tube Teardown, info wanted ?
Post by: oz2cpu on March 22, 2022, 09:42:49 pm

any of you know anything about this unit ?
On the case was written : PHILIPS PW 1965/20 DY1787
so i guess PW means production week ? 1965 could be the year ?
please tell more in the comments, if you know what the parts are..
I am a bit out of my top expertice here...

https://youtu.be/ZNZQkPB0wsE

Title: Re: X-ray detector Philips PW1965/20 DY1787 Geiger tube Teardown, info wanted ?
Post by: jmelson on March 22, 2022, 10:04:22 pm

This is part of an X-ray diffractometer set.  The whole setup would have a "pencil beam" X-ray source, a crystal holder in the center, and an X-ray detector on a movable arm called a goniometer.  In the old days, a piece of X-ray film was wrapped in an arc around the crystal, and a pattern of dark spots would appear when the film was developed.  Later methods used a detector and electronic counters to replace the film.  Even later systems had the goniometer computer-controlled so measurements could be taken at a range of angles.
Jon

Title: Re: X-ray detector Philips PW1965/20 DY1787 Geiger tube Teardown, info wanted ?
Post by: oz2cpu on March 23, 2022, 09:31:15 am

thanks a lot jon
for all that information
i do consider to re visit the trash location, to see if i can find the xray source and its powersupply

i am allready halve way thru the next video filming :  PORTABLE PROTON MAGNETOMETER
also a "thing" i know absolutly nothing about, cant even figure out what is the point in measure this type of magnetic field.

Title: Re: X-ray detector Philips PW1965/20 DY1787 Geiger tube Teardown, info wanted ?
Post by: jmelson on March 23, 2022, 04:36:37 pm

Quote from: oz2cpu on March 23, 2022, 09:31:15 am

thanks a lot jon
for all that information
i do consider to re visit the trash location, to see if i can find the xray source and its powersupply

i am allready halve way thru the next video filming :  PORTABLE PROTON MAGNETOMETER
also a "thing" i know absolutly nothing about, cant even figure out what is the point in measure this type of magnetic field.

Umm, ever heard of medical MRI?  It works by using magnetic field gradients to subtly change the natural precession frequency of protons in the water in the body.  A pulse of RF excites the protons and then they create a weak radio frequency emission as they continue to precess.
Jon

Title: Re: X-ray detector Philips PW1965/20 DY1787 Geiger tube Teardown, info wanted ?
Post by: TimFox on March 23, 2022, 06:55:07 pm

A small NMR spectrometer wrapped around a suitable liquid solution is used to measure external magnetic fields precisely, without the spatial encoding required for MRI imaging.
When I was working in MRI, we used such a "magnetometer" to measure the homogeneity and magnitude of the large static magnetic field.