What is the Real Impact? Richard Schmidt on Strontium, Mercury and Potassium in Fish

This opinion piece by Richard Schmidt ran as an editorial in the Brattleboro Reformer on August 26, 2011. Mr. Schmidt was kind enough to allow me to post it on my blog.

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Recently, the Vermont Department of Health (DOH) received a routine test report on one fish that was caught in the Connecticut River nine miles upstream from Vermont Yankee nuclear power plant in Vernon. The edible portion of this fish contained a very low but surprising level of radioactive strontium-90.

The DOH regularly monitors the environment for many such "radionuclides" to detect possible leakage from Yankee. This analysis of fish is part of that program.

Strontium-90 is a fission product that has spread throughout our environment predominately from pre-1964 nuclear bomb atmospheric testing, and is dissipating slowly with a 29 year half-life. Because strontium-90 is "hard to detect" and was detected in only one sample of fish flesh, a scientist will term such a result to be an "outlier." It lies outside of the norm. This subjects the sample and test process to scrutiny, and the result is held until further review. This is exactly what DOH has done by calling for more fish samples.

DOH said that they cannot associate low levels of strontium-90 with Yankee without supporting evidence. The DOH website also states that the result is "within the range of background strontium-90 in edible portions of fish reported in a 1971 study," prior to Yankee's startup.

Also, according to U.S. Department of Health "strontium-90 is a fairly constant part of the U.S. diet," and New York State has found similar strontium-90 levels in fish.

By taking more samples, DOH is doing a professional job and maintaining a scientific perspective on the matter.

But in a press conference found on YouTube, Governor Peter Shumlin blew this matter out of perspective when he called the strontium-90 level "high," attributed it to Yankee, and said that he would not eat fish from the river, although he did so as a boy.

He said this despite contrary information from his health department, and despite unwarranted damage to tourism. It appeared that his only purpose was to discredit Yankee.

Strontium and Mercury

This brings up two questions. The first is about strontium-90 levels over time. According to the DOH and other sources, the strontium-90 levels in fish that Gov. Shumlin ate as a boy were up to 20 times greater than the levels in this fish because radioactive decay and dispersion have since reduced the radioactivity.

The more significant question is about highly toxic mercury in our fish. Mercury in our environment is primarily due to coal-burning power plants, as coal contains mercury that is released from coal plant stacks.

Vermont and New Hampshire and most states issue advisories to limit the eating of locally caught fish due to mercury. For example, the N.H. Fish and Game Department warns against eating more than four wild-fish meals per month, restricted further to one meal per month for children and pregnant women. Children and the unborn are particularly sensitive to this neurotoxin. There is no direct connection between mercury and Yankee because the plant releases none. But if Yankee is shut down, its power will be largely replaced by low-cost coal power.

Unfortunately for us, most coal plants are to the west of us; New York has 48. The prevailing winds will carry more mercury, cadmium, arsenic, particulates and other pollutants to our environment, to the detriment of our health.

The Environmental Protection Agency wants stronger pollution controls on coal plants. It estimates such controls would reduce deaths in the U.S. by 17,000 per year and reduce related illnesses.

Radioactivity in Fish

Before making public statements about the fish, the governor should have asked "Is this strontium-90 significant?"

Let's compare the fish's strontium-90 radioactivity to the natural radioactivity that we ingest with fish and other foods, which contain the essential nutrient potassium and its inseparable radioactive isotope potassium-40.

A person eating the DOH fish sample would ingest about 2 percent of the radioactivity (6 percent of the radiation risk) from the strontium-90 relative to the natural potassium-40 in the same fish. Interestingly, natural potassium-40 makes our bodies about as radioactive as that fish in the news.

What is the Real Impact?

In truth, neither the strontium nor the potassium are significant hazards at all.

The question "Is this material significant to my health?" was completely lacking in this case. The real health impact of Gov. Shumlin's statements is to encourage the burning of more coal and the continued mercury pollution of our fish, our bodies, and our biosphere.

Richard Schmidt is a chemical and nuclear engineer and energy consultant who is not associated with Vermont Yankee. He lives in Westmoreland, N.H.

Fish shield image is the coat of arms of Narva, Estonia.

Mercury image from Wikipedia.

The Shumlin press conference video is also on one of my earlier blog posts.

Tritium, Oil, and Kale

With all the endless hassles about "who said what to whom" about piping at Vermont Yankee, I decided to do a cheerful post for once. Just for a change. Then I will return to our regularly scheduled difficulties.

First of all, a big thanks to Rod Adams for his perspective on the tritium leak at Vermont Yankee. He points out that the EPA describes tritium as one of the "least dangerous radionuclides." A person would have to drink swimming-pools worth of the stuff to receive a lethal dose. They'd drown first. Rod compares this tritium leak to massive oil spills that are ignored by the press.

Oil spills are dangerous. Oil is carcinogenic. In general, the negative health effects of petroleum hydrocarbons are ignored by the press and the population. It would be funny if it weren't sad.

In Montpelier, my friend Howard Shaffer told a legislator that this tritium leak was a spill, like spilling oil on the floor of your garage, but just like the oil, it could be cleaned up. "Well, at least the oil won't give me cancer," the legislator answered. (She will be not be named in this blog. I try to protect the clueless.)

Hydrocarbons are sources of cancer-causing compounds. Here's a nice little how-to article about changing your oil, with the usual warnings about not getting it on your skin, and a note that most landfills will not accept used oil, even in sealed containers. The government warns you to avoid prolonged contact with motor oil, as it caused skin cancer in laboratory animals.

Another thanks is due to John Wheeler, whose podcast compares this tritium leak with earlier leaks at San Onofre. John uses a Brazil nut analogy instead of the banana analogy I used, to compare drinking from the test well with ordinary exposure to beta-particles. We both point out that the amount of radiation in the test well is a fraction of the amount we get on a daily basis.

Sometimes there are unintended consequences to blogging. I fear that someone will read this and decide to give up bananas and Brazil nuts. I may have scared some people. They may be coming to the erroneous conclusion that tropical fruits are radioactive.

I hope these readers understand that potassium is slightly radioactive, but it is also a necessary part of everyone's nutrition. (However, people with some types of kidney disease must avoid potassium.) If you don't have kidney disease, and you don't want tropical fruits, please eat some spinach or kale. Half a cup of cooked greens has about the same amount of potassium as a banana.