The reactor power was a max of about 1/2 a watt. See http://www.cfo.doe.gov/me70/manhattan/cp-1_critical.htm for an account of the experiment.
As far as radiation is concerned, this report does not give a figure, or even mention whether radiation was measured. The pile does not seem to have had any shielding, so the large group of observers as well as the experimental team would have had some radiation exposure, but limited in intensity and time. These were very early days, but the later reactors at Oak Ridge and Hanford had shielding.
Yes, the decay of unstable atomic nuclei is the source of nuclear radiation.
Project Manhatten, the first atomic reactor.
That would depend on the yield of the bomb, the power rating of the reactor, and the lifetime of the reactor. Bombs release all their energy in microseconds, reactors take years or decades.
This was built as part of the Manhattan Project in WW2, to demonstrate the principle of the chain reaction. The results were used to design the Hanford piles to produce plutonium. The chief scientist for the Chicago pile was Enrico Fermi, first criticality in 1942
Atomic bombs use nuclear fission, where heavy atomic nuclei split into smaller ones releasing energy and radiation. Hydrogen bombs use both nuclear fission and fusion, with fusion reactions involving the combining of light atomic nuclei to release even more energy and radiation. Hydrogen bombs are typically more powerful and produce higher levels of radiation compared to atomic bombs.
An atomic reactor.
1923
Enrico Fermi
The first sustained nuclear chain reaction was in the CP-1 reactor in Chicago, IL.The X-10 reactor in Oak Ridge, TN was used to develop plutonium production reactor technology.Three reactors at Hanford, WA beginning with B reactor produced the plutonium.
The original name of a nuclear reactor is an "atomic pile". The term was first used by Enrico Fermi to describe the experimental setup of the first controlled nuclear chain reaction in Chicago during the Manhattan Project in the 1940s.
The first inventor of a nuclear reactor was Enrico Fermi. Refer to link below.
Nuclear reactions in a nuclear reactor are controlled reactions. The reactions in the atomic bomb are not controlled reactions