yes it is some alternatives are:
mushroom phycology
cheese dancing
greshmism
goo treatment
At less than critical mass, there are fewer "targets" for neutrons to strike, fission, and release more neutrons. As a result, the reaction dies out.
Critical Mass - Catholic rock - was created in 1996.
Critical Mass - Threshold album - was created on 2002-09-02.
We know that critical mass can be achieved in a nuclear reactor. If it could not, we'd not be able to get a chain reaction and generate heat to generate power. Reactors don't have critical mass when the control rods are in, but pull the rods, start the reactor up and away you go!
The critical mass depends on the shape; I don't think there is an upper limit to that.For the case of a sphere, the critical mass for U-235 is 52 kg. The corresponding diameter of the sphere is 17 cm.
kingpen
Critical Mass - 2001 is rated/received certificates of: Australia:M Germany:16 New Zealand:M USA:R
Critical Mass is a mutant in the video game Spider Man and the Web of Shadows. He grills Spider Man with questions about his past.
The age of the material.
a chain reaction
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Each isotope has a different critical mass. U235 is used because the mass needed to cause a reaction is smaller than almost all other isotopes. This critical mass is calculated as( 3.001 x 9.987 to the 11th power) Divided by the weight of one nuclei X 2.5675 (x 10 to the 24th power) divided by mass. This equals 7.702 X 10 to the 13th power divided by mass. You can tell by this calculation that critical mass for u235 is very low at about 1.3 kg. Best regards, Bruce