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Live particle tracks
Nuclear and particle physics · Nobel Prize in Physics, 1927 · C. T. R. Wilson

Let students see invisible radiation with their own eyes.

Background radiation and cosmic rays become visible trails your whole class can watch, all period long, with no dry ice.

PJ45 cloud chamber
PJ45 cloud chamber · available in the U.S. only through American Scientific
Exclusive U.S. distributorAmerican Scientific, LLC
PHYWE, since 1913Göttingen, Germany
Built for U.S. labs110V/60Hz, U.S. warranty and parts
Funding helpWe help you find and apply for grants
Diffusion cloud chamber PJ45,115V
✓ Available in the U.S. 110V/60Hz Adapted U.S. Exclusive
Modern Physics / Nuclear & Particle Physics

Diffusion cloud chamber PJ45,115V

Article No. 09046-90

Continuously operating, mechanically cooled chamber for visualizing the tracks of radioactive radiation. It is particularly suitable for demonstrations, teaching, and training purposes and enables clear real-time observation of particle tracks

✓
Available in the United States, 110V/60Hz adapted for direct use in U.S. labs
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Exclusive U.S. Distributor, American Scientific, LLC is the sole source for PHYWE products in the U.S.
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Questions? Call 888-490-9002 or email office@am-sci.com for pricing, availability, and grant assistance.
Available through American Scientific

All units adapted for 110V/60Hz. Contact us for volume pricing and grant assistance.

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Particle tracks forming in a PHYWE diffusion cloud chamber
Real footage · PHYWE diffusion cloud chamber

Every streak is a particle that just passed through your classroom.

Alpha particles, electrons and cosmic-ray muons from natural background radiation leave trails of condensation in the alcohol vapor. Nothing is staged or simulated: this is what your students see.

3 track typesAlpha, beta and muons to spot
No source neededNatural background radiation
No dry iceMechanically cooled
Nobel 1927C. T. R. Wilson
Bring this to your lab →
What your students will do
ContinuousRuns all class period, no dry ice
Real timeTracks visible as they happen
115 VU.S. power version
1

Switch it on

The chamber cools itself and builds a layer of supersaturated alcohol vapor, ready for continuous use.

2

Watch the tracks appear

Charged particles leave trails of condensation that students can see from across the room.

3

Identify the particles

Compare track length, thickness and shape to tell alpha particles, electrons and muons apart.

A great fit for
PhysicsNuclear and Particle PhysicsModern PhysicsOutreach and Demonstrations
What students see

Learn to read the tracks

Each kind of radiation leaves its own signature. Within minutes, students start calling out what they see.

Alpha particlesShort, thick, bright and straight. Heavy and slow, they stop within a few centimeters.

Electrons (beta)Thin, faint and wandering. Light particles scatter easily off the vapor.

Cosmic-ray muonsLong, thin, straight lines that cross the whole chamber, arriving from the upper atmosphere.

Close-ups photographed in a PHYWE diffusion cloud chamber. Click to enlarge.
Choose your chamber

Three PHYWE cloud chambers, one experience

Part of PHYWE’s Nobel Prize ExperimentsSee all nine Nobel Prize experiments side by side and flip through the 2025 Premium Experiments brochure.
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Planning next year's lab budget?Federal STEM and CTE grants can cover up to 100% of equipment costs. American Scientific helps you find and apply for the right one, at no charge.
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Common questions
Does it work on U.S. power?

Yes. Units supplied through American Scientific are adapted for 110V/60Hz and supported in the U.S., including warranty and replacement parts.

Do I need a radioactive source?

No. The chamber shows natural background radiation and cosmic rays on its own. An airlock lets you safely add a licensed demonstration source if you want to show specific radiation types.

What does it consume?

Only isopropyl alcohol (2-propanol), which is fed automatically from the built-in tank.

Can it run without supervision?

Yes. The built-in timer switches the chamber on and off on a schedule, so it is ready when class starts.

What else do I need to run the experiment?

Tell us about your lab in the form above and we'll put together a complete, ready-to-teach configuration, so nothing is missing on day one.

Can grant funding cover this?

Often, yes. Many institutions fund PHYWE equipment through NSF, Title IV and CTE programs, and our team can help you find and apply for the right opportunity.

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