written 22 December, 2024
published 29 December, 2024
Modern chemistry states an element is defined by the number of positively charged protons in the atomic nucleus, ranging from 1 to 94. The nucleus also contains neutrons, and isotopes of an element contain different numbers of neutrons. The positive protons, and the balancing number of negative electrons, determine the chemical activity of each element, totally independent of the number of neutrons.
Modern physics has demonstrated that among the heavier elements, 28 are radioactive, which will spontaneously fission, break apart, or decay, releasing energy. The result is two smaller elements (daughter products), heat, and assorted high energy particles, including stray neutrons. When fast neutrons impact other radioactive atoms, causing them to fission as well, a chain reaction occurs, releasing increasing amounts of energy.
This possibility was first realized in 1938, as WWII was brewing. The first controlled chain reaction occurred in December, 1942. After an intense industrial program produced nuclear material, the first nuclear bomb was tested in Nevada in July, 1945. Two more bombs were deployed against Japan a month later. The Atomic Age had begun.
In 1955, the US initiated Atoms for Peace, beginning commercial use of nuclear power for electrical generation. This was an effort to distract from the shocking destructive power of nuclear weapons, and to justify the huge expenditure to produce nuclear material.
No electrical utility or corporation wanted to take on the massive, unknown economic risk of developing nuclear power, so the government threatened to put them out of business by creating public nuclear power "too cheap to meter". As an incentive, the government absolved them from all liability, forever. It also promised to subsidized nuclear fuel costs and take responsibility for ultimate disposal of nuclear waste.
The Shippingport Atomic Power Station, in Pennsylvania, was the first commercial reactor, becoming operational in 1957, using a 60 megawatt repurposed aircraft carrier reactor. Since then, 139 commercial reactors have been built in the US, mostly between 1970 and 1990, of which 94 are still operating today, most are rated over 1,000 megawatts. Nuclear power involves big money.
When as little as 5 percent of the uranium in a reactor fuel rod has been consumed, the daughter products of fission degrade operational efficiency, and the rods must be replaced. This "spent fuel" is intensely radioactive, and is currently stored "temporarily" at reactor sites, some for decades, still awaiting adequate permanent disposal. The few domestic attempts to reprocess spent fuel have led to bankruptcy and massive radioactive clean up problems. No large reactor has been fully decommissioned, and clean up from the war effort is still incomplete.
The production of fast neutrons, while essential for the chain reaction, is also a significant problem, because such radiation is harmful to living systems. The intense security around the war time nuclear bomb effort meant no biologists were involved, so everyone was unprepared for the wide spread, long lasting death and injury from the radiation damage in Japan.
Because radiation can't be seen or felt, it is easily ignored or hidden. The resulting damage occurs long after the exposure, making it difficult to prove responsibility. Massive public relation campaigns promote "radiation psychosis", mental fantasies, rather than accepting real health impacts. Every site that deals with nuclear material contaminates the soil, air and water. Workers at production sites and civilians downwind of test sites or nuclear facilities have been kept ignorant, unknowingly exposed, all to protect profits.
Of course, ignoring a problem doesn't really make it go away. Unlike all chemical toxins, no living system "eats" radioactivity. Only natural decay over time resolves the issue. While the decay time of a single atom is unknowable, the decay of half of a sample (half-life) can be known. Some radioactive isotopes have a half-life of a fraction of a second. The half-life for uranium, is 4.5 billion years, essentially radioactive forever.
Uranium is also a chemically toxic metal, which mimics calcium and estrogen. Biological systems tend to concentrate these elements in the bones, kidneys, liver, and reproductive glands. This can cause diseases and negative reproductive health impacts.
With wide spread unacknowledged adverse health impacts, a final waste disposal solution still a future dream, aging infrastructure, consumption of a finite fuel source, and operating costs the highest on the electrical grid, nuclear power is still the choice of big money. We have the knowledge to split the atom, but not yet the wisdom to refrain from doing so.