Best Dosimeter for 10 ns Pulse Dose Measurement

Salman Khan · Jul 12, 2023

Which type of dosimeter is best for pulse short (duration let say 10 ns) dose measurement purpose?

russ_watters · Jul 12, 2023

None? By definition a dosimeter measures dose over time. Or do you mean pulses over time?

10ns pulses sounds.....odd. can you say exactly what the application is?

berkeman · Jul 12, 2023

russ_watters said:

10ns pulses sounds.....odd. can you say exactly what the application is?

Let's just say that he has a unique job in the industry...

https://www.freepik.com/free-photos-vectors/nuclear/9

Salman Khan · Jul 13, 2023

russ_watters said:

None? By definition a dosimeter measures dose over time. Or do you mean pulses over time?

10ns pulses sounds.....odd. can you say exactly what the application is?

If I want to measure the dose of FXR machine which may be use for radiography purpose. Such a machine produce output x-ray pulse of ns wedth.

gleem · Jul 13, 2023

I think a thermoluminescent dosimeter (TLD) would be a good possibility since response time is irrelevant.

Salman Khan · Jul 14, 2023

What is your idea about pocket dosimeter based on ion chamber ?

gleem · Jul 15, 2023

That depends on what you will be using it for; since it is bulky it has low spatial resolution compared to a
TLD for example.

EDIT: to be clear it has to be uniformly irradiated.

Tom.G · Aug 5, 2023

If you do not need real-time readings, the old-style photographic film dosimeter may be useful.

For real-time readings, perhaps a scintillation counter would do it.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3000535/
(found with:
https://www.google.com/search?hl=en&q=xray+scintillation+dosimeter)

A Geiger Counter can also be used:

From:
https://www.nrc.gov/reading-rm/basic-ref/students/science-101/what-is-a-geiger-counter.html

Other types of instruments can provide an exposure rate (expressed as milliroentgen per hour or mR/hr). These counters must be calibrated to read a particular type of radiation (alpha, beta, gamma, neutron, x-ray) as well as the amount of energy emitted. The reading will only be accurate for that type of radiation and that energy level. And these instruments need to be calibrated regularly to be sure they are providing correct information over time.

Cheers,
Tom

Alex A · Aug 6, 2023

Hi Tom,

A Geiger counter can't work because a single beta particle would create one electrical pulse with a few microseconds dead time after and a 100ns criticality accident pulse of radiation would create one electrical pulse with a few microseconds dead time.

For a similar reason a commercial scintillation counter would also not work.

gleem · Aug 6, 2023

An additional issue with GM counters is that if the pulse is intense enough (which it must be if it is only 10 nsec wide) the radiation may cause the detector to go into a continuous discharge and become unresponsive. An ionization chamber might be possible although ion recombination issues may still be associated with the high-intensity beams.

Best Dosimeter for 10 ns Pulse Dose Measurement

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