Dose calculation for oscilloscope

[Salman Khan]

If pulse source output is recorded by a detector on oscilloscope, is it possible to calculate dose from this output voltage pulse?

 

[Alex A]

That depends on the detector and any amplifier. For an ion chamber it would be the total charge transferred, which would be the area under the curve on an oscilloscope trace under some circumstances, or the height of the pulse in others.

A Geiger counter tube would not work. Some other forms of detector might work, but interpreting the result might be challenging.

 

[Salman Khan]

That depends on the detector and any amplifier. For an ion chamber it would be the total charge transferred, which would be the area under the curve on an oscilloscope trace under some circumstances, or the height of the pulse in others.

A Geiger counter tube would not work. Some other forms of detector might work, but interpreting the result might be challenging.

In case of PMT or other solid state detector?

 

[Alex A]

A commercial PMT/Scintillator would probably fail to work. Counters are usually designed with high value resistor chains to save power and with small value capacitors close to the anode. These saturate easily. Spectroscopy grade combinations would probably damage themselves at fairly low exposures.

If you are measuring the dose within the beam I would expect a strong pulse of light from the scintillator. Much more than would be a good fit for a PMT.

A reverse biased diode would probably give a signal, but at these power levels there may be a lot of nonlinear effects. A scintillator connected to a photodiode by a light pipe or fiber optic cable might work well.

I'm bothered that you seem to be trying to reinvent the wheel for instrumentation for a very dangerous device.

 

[Salman Khan]

Dear Alex, very thanks for sharing your experience.

 

[gleem]

Why use an oscilloscope? An ion chamber and a DVM works and is standard for dose measurement of x/gamma radiation.

 

[Salman Khan]

So far as I know ion chamber is gaseous detector having response tim in micro second, how is it possible to measure a pulse dose of nano second pulse using ion chamber ??

 

[gleem]

You didn't say nanoseconds. It works for microseconds for sure. The problem with nsec. pulses is ion recombination. A solid-state detector can be used, I think, instead of an IC, but can be calibrated with a longer pulse width beam relative to an IC.

Just found this for ICs https://www.drct.com/Ion_Chambers/TBM-IC-Pulse-X.html