Difference between revisions of "Radon measurement with DIY track detectors"

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(Created page with " Radon: origin, health effects, measurements, Marco Silari, CERN: https://indico.cern.ch/event/394905/contributions/1833068/attachments/790741/1083885/Seminar_CERN_on_Radon.pd...")
 
(Second Experiment)
 
(16 intermediate revisions by the same user not shown)
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Radon: origin, health effects, measurements, Marco Silari, CERN:
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[https://indico.cern.ch/event/394905/contributions/1833068/attachments/790741/1083885/Seminar_CERN_on_Radon.pdf Radon: origin, health effects, measurements, Marco Silari, CERN:]
https://indico.cern.ch/event/394905/contributions/1833068/attachments/790741/1083885/Seminar_CERN_on_Radon.pdf
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Can we use the [http://www.gaudi.ch/GaudiLabs/?page_id=652 DVD laser scanner] to see the holes?
 
Can we use the [http://www.gaudi.ch/GaudiLabs/?page_id=652 DVD laser scanner] to see the holes?
  
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And could we use a DVD as detector material (Polycarbonat)? And how about modifying a DVD player to read the holes? And using old [http://www.madehow.com/Volume-1/Compact-Disc.html?fbclid=IwAR1BgVsXp1ENO7IQ40Zzs4qyFAXULKEaImdA3fyKcXYohmnLk4GstQvWOGM CDs or DVDs] from a cellar to determine the radon concentration? Make it a community science project?
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People have looked into this before:
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[https://www.sciencedirect.com/science/article/pii/S0969804312005891?via%3Dihub&fbclid=IwAR3btZCotqYo5Yk7xaBuC7zuBWTfJ9WT15Vdkk93cAr13VyGvHalu_AyE_4 Application of polystyrene films for indoor radon dosimetry as SSNTD]
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[https://www.sciencedirect.com/science/article/pii/S0265931X10000391?fbclid=IwAR2UoHxjkZbrBHFVvHSOVOT-JNTlsw81cKcg8CsiScRtIp7TADCSmk1X3Jo Radon mapping by retrospective measurements – an approach based on CDs/DVDs]
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echt geil
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How about Electrochemical etching or Ultrasonic etching?
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== First Experiments ==
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Let's try and meet at SDG Solution Space in Geneva for "Open Hackuarium 228 "Sans les murs" #2, Spécial Genève"
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[[File:SDGSolutionSpaceTemporaryLab.jpg|400px]]
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[[File:HotPlateUltrasonic.jpg|200px]] [[File:NaOH.jpg|200px]]
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Hmm... did not work. No traces.
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== Second Experiment ==
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Let's try again.
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Maybe we need to use ultrasonic bath or electrochemical etching?
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Electrochemical etching with 15 kV AC/cm, 40 kHz.
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[http://sci-hub.tw/https://www.sciencedirect.com/science/article/abs/pii/0029554X80905728 Electrochemical etching studies of the CR-39 plastic]
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[[File:ElectrochemicalEtchingAparatus.png|400px]]
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Getting the CR39 from ebay, it's cheap. (Look for "CR39 welding")
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[[File:CR39.jpg|300px]]
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Put a piece of CR39 and a piece of delaminated DVD-R on an alpha source (Quantum Pendant), then 2 hours in 7M NaOh in an ultrasonic bath a 70-80°C.
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The source produces about 2-5 big alpha impacts per cm2 per second.
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And there seems to be something. One side of the plastic sample turned milky. The other side that was covered by a scotch tape during radiation (not during the etching) is clean.
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[[File:DVDSampleRadonTracks.jpg|250px]]  [[File:CR39SampleAlphaTracks.jpg|250px]]
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DVD sample and CR39 sample
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Inspecting the samples under the microscope. There are holes or bumps in different densities and with a size of about 3um of diameter.
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[[File:DVD.png|300px]] [[File:CR39_2.png|300px]]
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DVD sample and CR39 sample under the web cam microscope. (400x)
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Tried to look at the samples with the DVD scanning microscope. Looks nice:
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[[File:LaserDumpAlpha1.png|300px]] [[File:LaserDumpAlpha2.png|300px]]
  
  
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Links:
 
Links:
  
[Measurement of Radon Gas Concentrations in Tap Water for Baghdad Governorate by Using Nuclear Track Detector (CR-39) http://pubs.sciepub.com/ijp/3/6/2/?fbclid=IwAR0GLvaM6EkER8TcrBJIdTH-v8hPOXcyBhTL42tHuLWhxjHgkD6ixtpC9gg]
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[http://pubs.sciepub.com/ijp/3/6/2/?fbclid=IwAR0GLvaM6EkER8TcrBJIdTH-v8hPOXcyBhTL42tHuLWhxjHgkD6ixtpC9gg Measurement of Radon Gas Concentrations in Tap Water for Baghdad Governorate by Using Nuclear Track Detector (CR-39)]

Latest revision as of 17:43, 28 November 2018

Radon: origin, health effects, measurements, Marco Silari, CERN:


RadonLaserScanner.png


Playing with Radioaktiviät - cool.

Alpha particles form the gas or liquid shoot holes in the plastic, then you develop it to make the hole bigger. Take CR-39 Plastic (from laser googles ?) etch it with 7M NaOH, 70°C for 5h ?


1 M NaOH is 40g

NaOH is commonly used to develop photo-resist when making DIY printed circuit boards... so we should have some in the lab.

PMMA/Acryl should work as well...

Can we use the DVD laser scanner to see the holes?

And could we use a DVD as detector material (Polycarbonat)? And how about modifying a DVD player to read the holes? And using old CDs or DVDs from a cellar to determine the radon concentration? Make it a community science project?

People have looked into this before: Application of polystyrene films for indoor radon dosimetry as SSNTD

Radon mapping by retrospective measurements – an approach based on CDs/DVDs

echt geil

How about Electrochemical etching or Ultrasonic etching?

First Experiments

Let's try and meet at SDG Solution Space in Geneva for "Open Hackuarium 228 "Sans les murs" #2, Spécial Genève"

SDGSolutionSpaceTemporaryLab.jpg


HotPlateUltrasonic.jpg NaOH.jpg


Hmm... did not work. No traces.

Second Experiment

Let's try again.

Maybe we need to use ultrasonic bath or electrochemical etching?

Electrochemical etching with 15 kV AC/cm, 40 kHz.

Electrochemical etching studies of the CR-39 plastic

ElectrochemicalEtchingAparatus.png

Getting the CR39 from ebay, it's cheap. (Look for "CR39 welding")

CR39.jpg


Put a piece of CR39 and a piece of delaminated DVD-R on an alpha source (Quantum Pendant), then 2 hours in 7M NaOh in an ultrasonic bath a 70-80°C.

The source produces about 2-5 big alpha impacts per cm2 per second.

And there seems to be something. One side of the plastic sample turned milky. The other side that was covered by a scotch tape during radiation (not during the etching) is clean.

DVDSampleRadonTracks.jpg CR39SampleAlphaTracks.jpg

DVD sample and CR39 sample

Inspecting the samples under the microscope. There are holes or bumps in different densities and with a size of about 3um of diameter.


DVD.png CR39 2.png

DVD sample and CR39 sample under the web cam microscope. (400x)

Tried to look at the samples with the DVD scanning microscope. Looks nice:

LaserDumpAlpha1.png LaserDumpAlpha2.png


Links:

Measurement of Radon Gas Concentrations in Tap Water for Baghdad Governorate by Using Nuclear Track Detector (CR-39)