Onions and Potatoes in Nuclear Bomb Testing: A Guide to the Food Tests

Posts that travel well give two kitchen vegetables a strange job at a nuclear test. They say onions and potatoes are buried to soak up the blast, sometimes by the millions of tons, and a few headlines go on to say a bomb cannot be made without them.

Those vegetables meet radiation work in several separate jobs: as food set out to see what a blast does to a pantry, as onion roots scored under a microscope for a rough dose check, as warehouse crops irradiated so they store longer, as an extract added to human white blood cells, and as a research potato built to fluoresce when gamma rays hit it. Each section below matches one of those jobs to the record behind it.

What Did the 1955 Food Trenches Hold?

During Operation Teapot at the Nevada Test Site in 1955, civil-defense planners wanted to know what a nuclear shot would do to food in a town. The record is the 1955 semiperishable foods report, prepared for the Food and Drug Administration and the Federal Civil Defense Administration and dated February 1956.

One shot was about nominal, a size the report sets at 20 kilotons of TNT, and the second shot was about half as large again. The foods in the trial were apples, oranges, potatoes, onions, raisins, dry beans, dry milk, cereals, flour, and candy. Some went into trenches close to the blast under a thin soil cover, and some sat on shelves in houses built at the site.

Potatoes carried more of that induced activity than onions, apples, or oranges. The soil over the sacks was only a dusting so the food could sit in a buried position, which is a placement for a measurement, not a blanket around the shot.

Where Does the Burial Story Leave the Test Record?

The circulating version adds a tonnage, a promise that the vegetables absorb alpha, beta, and gamma rays for people nearby, or a claim that the weapon itself depends on them. Some versions also move the burial to other countries’ test sites. The written record that logs onions and potatoes in trenches at measured distances is this US food trial.

That report describes ordinary packages in shallow trenches and in test houses, then records crushing, neutron-made radioactivity, and lost sprouts. It gives no tonnage of onions, and it never frames the vegetables as a layer that makes the shot safe for a nearby population. Weapon design is outside the report entirely.

Glass, tin, chipboard, and plastic film all let the neutron effect through, so the wrapper did not decide how radioactive the contents became. Rolled oats in a tin and rolled oats in a chipboard carton showed a similar amount, and raisins in foil and in clear film did too. The radioactivity the testers worried about was created inside the food.

How Do Onion Root Tips Mark a Radiation Dose?

Onion roots get folded into the same story because they really are a radiation tool, of a narrower kind. The cells at a root tip are large, they divide on a schedule a lab can catch, and broken chromosomes leave small extra nuclei and other errors that can be counted. You expose a bulb, grow the roots, and score those errors under a microscope.

The count moves with the dose, which is why onion roots have served as a rough biological dosimeter in research, including work aimed at nuclear and radiological emergencies. A higher tally means more damage got through to the dividing cells. The root is there to show the hit, and the method starts only after the exposure has already happened.

How Does Sprout Control Use Radiation on Purpose?

Storage work is easy to mash into the bomb story because it also pairs these crops with radiation. Warehouses irradiate bulbs and tubers so they do not sprout on the shelf. The aim is a longer storage life, and the source is a sealed unit or a machine that the operator can turn off, not a weapon test.

THE DOSE CAP ON FRESH FOOD

• The use: Growth and maturation inhibition, the heading that covers holding back sprouts in fresh crops.
• The ceiling: the US rule on irradiating food caps that use for fresh foods at 1 kGy (100 krad).
• The sources: Gamma rays from cobalt-60 or cesium-137, electrons from machines at up to 10 million electron volts, or X-rays within the energies the rule lists.

The Teapot report points to earlier storage studies in which about 10,000 to 20,000 r of gamma rays stopped potato sprouting, and the close-trench potatoes sat above that range. Sprout control is a chosen dose under a written schedule. The trench dose was whatever the shot delivered, neutrons included, and the lost sprouts were an injury recorded afterward.

What Did Onion Extract Do to Human White Blood Cells?

A separate line of work leaves the whole vegetable and tests a liquid extract on human cells. The group that ran the best-known version framed it around health worries after the Fukushima accident in 2011, and they chose bleomycin, a drug that cuts DNA, as a stand-in for radiation. The cells stayed in a dish.

Pretreatment Before the DNA-Cutting Drug

Onions are among the richest food sources of flavonoids, which is the reason the 2016 onion extract study pretreated human lymphocytes and then added bleomycin. Lymphocytes are a type of white blood cell. The extract levels and the chemical levels were tiny volumes in culture, not a bowl of soup.

• Micronuclei: Pretreatment at 10 and 20 microlitres per millilitre lowered the micronucleus count at every bleomycin dose in the test.
• DNA strands: At 3 micrograms of bleomycin per millilitre, that same pretreatment also lowered the strand damage in the comet assay.
• Living cells: Cells given 20 microlitres per millilitre of extract plus 1 microgram of bleomycin per millilitre left more living cells than bleomycin alone.

The paper’s own conclusion stays inside that setup. Onion extract may protect human lymphocytes from this chemical’s cell killing and DNA damage. It does not measure a person, a meal, or a blast.

When Did Onion Extract Increase the Damage?

The 2016 pattern used a drug stand-in and a pretreatment. The next question is what the same kind of cell does when the exposure is gamma rays and the extract is present during the dose. In a 2025 test on real gamma rays, Raquel Cordeiro de Oliveira and colleagues added an aqueous extract of onion bulbs to human lymphocytes across three doses.

The 2 Gy row breaks a blanket claim of protection, because the micronucleus frequency rose when the extract was present. The authors describe a dual pattern that depends on the dose and on the extract concentration, and they treat it as a reason for more tests, including differences from person to person.

What Was the Potato Sensor Built to Report?

Recent posts often borrow a University of Tennessee potato and describe it as a crop that soaks up gamma rays. Robert G. Sears built the Tennessee potato radiation sensor so the plant’s own response to DNA damage would drive a fluorescent signal in the leaves.

In the 2023 tests that signal answered across 10 to 80 Gy, and it could be read from more than 3 meters away. The leaves are a warning that gamma rays arrived. A reporter plant has to receive the rays, which is a different job from a sponge meant to keep those rays off everything else.

What to Do in a Real Radiation Release

If local authorities warn of a release, their instructions are the action list: time indoors, distance from the source, and dense cover such as soil and building material. Onions and potatoes in the kitchen do not stand in for that cover. Nothing in the trench test, the root-tip count, the warehouse dose, or the cell dishes supplies a grocery item that lowers your dose.

Suspected radiation injury after a known accident, or after a warning you were told to treat as urgent, is a reason to contact local emergency services. These papers never tested a serving, a supplement, or a person in fallout, so they cannot set a kitchen amount to eat before or after an exposure.

Frequently Asked Questions

Which Cells and Dye Did the Onion Extract Study Use?

The 2016 work used white blood cells taken from human blood samples, and it scored living cells with trypan blue, a dye that darkens dead cells and leaves living cells clear. That check still happens in a dish. It does not show what happens when a person eats onion before or after a real exposure.

Were Dry Staples More Affected Than the Fresh Onions?

Dry milk, dry beans, raisins, and ready-mixed cake and biscuit flours were the staples flagged for high neutron-made radioactivity. Nonfat dry milk from the close trench also developed a very strong stale flavor and odor once it was mixed again. The sharpest flavor note in that write-up lands on the milk, not on the onions.

Can an Onion Root Tip Replace a Handheld Meter?

An onion used this way is exposed first, then rooted, then read under a microscope as a count of damaged dividing cells. Researchers use that count to estimate a dose after the fact. It will not give you a live number while you are standing in a contaminated place, and it is not a substitute for an instrument or for official instructions.

Which Packages Broke When the Blast Hit the Kitchens?

Chipboard cartons with a film window, and cellophane bags, were the containers that broke most often after the blast knocked them off kitchen shelves. Most other consumer packages in the houses survived that fall to the floor. The wrapper question and the radioactivity question are separate, since the package type did not set the neutron effect inside the food.

The household note in the food report is almost domestic. A basement food cabinet should be a relatively safe place for an emergency supply, the testers wrote in substance, because food on those shelves stayed put even in houses where the rooms above were destroyed. That finding is about walls and a lower shelf, and the onion and the potato are only examples of what a family might have stored there.

Disclaimer: This article is an educational guide to public test records and laboratory studies. It is informational only and is not medical, radiation-safety, or emergency advice. If you may have been exposed to radiation, or if officials have issued a warning, contact local emergency services and follow guidance from qualified radiation and medical professionals before you act. Doses, rules, and study results reflect the sources reviewed here and can change.