No Photon
Give me the Gamma
Fissile Friends
Cross Section Giants
Contamination
100

This radionuclide found in organisms can be used for dating. 

What is Carbon-14?

100

Twin high-energy gammas are produced by this radionuclide commonly used for gamma irradiation.

What is Cobalt-60?

100

This naturally occurring fissile nuclide is enriched to <20% in our fuel elements.

What is Uranium-235?

100

This nuclide makes up the poison sections of our control rods. 

What is Boron-10?

100

This gaseous radionuclide is formed from irradiation of air. 

What is Argon-41?

200

This tiny radionuclide is found in self-luminous exit signs.

What is Tritium (Hydrogen-3)?

200

The vast array of gamma energies from this nuclide make it valuable for performing Quality Control checks on our gamma specs. 

What is Europium-152?

200

This fissile alpha emitter is commonly found in smoke detectors.

What is Americium-241?

200

This fission product has the largest known (n,γ) cross section.

What is Xenon-135?

200

This radionuclide is produced by activation of oil poured down the lazy susan tube and contaminates all our TRIGA tubes.

What is Selenium-75?

300

This beta emitter is used in our GSM and CAM sources. 

What is Technetium-99?

300

6 MeV gamma rays from this short-lived radionuclide are why we disturb the pool water to prevent it from reaching the surface. 

What is Nitrogen-16?

300

This fissile nuclide created in our core is also found in the Howtizer. 

What is Plutonium-239?

300

This stable fission product acts as a significant neutron poison in our core. 

What is Samarium-149?

300

Rabbit samples contaminated with sweat might exceed activity calculations due to the formation of this nuclide. 

What is Sodium-24 OR Chlorine-38?

400

This beta emitter, along with its beta emitting decay product, is a source of much of the radioactive heat in spent fuel. 

What is Strontium-90?

400

This decay product undergoes isomeric transition producing the characteristic gamma rays in our Shepard source. 

What is Barium-137m?

400

This fissile nuclide is used as a neutron source owing to its 3% Spontaneous Fission branching ratio. 

What is Californium-252?

400

This isotope possesses the largest (n,γ) cross section of any stable nuclide.

What is Gadolinium-157?

400

This gaseous radioisotope released in the Uranium Series is responsible for a majority of background radiation. 

What is Radon-222?

500

This short-lived alpha emitter has been used as a poison due to its high internal damage and lack of easily detectable gamma radiation. 

What is Polonium-210?

500

The most common terrestrial isotope of Argon differs from those produced in stellar nucleosynthesis due to decay of this lightest primordial radionuclide. 

What is Potassium-40?

500

This unusually long-lived fissile alpha-emitter is the heaviest isotope with a half-life over a million years. 

What is Curium-247?

500

This extremely long-lived radionuclide is commonly used to eliminate thermal flux for experimentation

What is Cadmium-113?

500

Formation of this nuclide might explain a drop in power when using the rabbit without gloves.

What is Chlorine-36?

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