He Wrote Down What The Needle Said. Somebody Else Did The Arithmetic.

NETTLEHAM, England — The calibration card is a buff slip four inches by two and a half, stapled into the equipment register of a civil engineering squadron at RAF Woodbridge. It records the last workshop calibration of radiac set 27J-4471 on 26 October 1978, and it gives the next due date as 26 October 1979.

The set went into Rendlesham forest on the night of 27 December 1980, signed out to a security police patrol, in the hand of a senior airman named Dennis Bilyeu.

Fourteen months past due. That is the smaller half of what is wrong here.

What the needle said

Bilyeu is 71 and lives seven miles north of Lincoln in a bungalow with a lawn he is openly proud of. He married a woman from Woodhall Spa in 1983 and never went back to Indiana.

He remembers the meter better than he remembers the lights, which he says is the thing nobody has ever wanted to hear.

"It wasn't reading," he said. "That is the whole memory. It was on the times-nought-point-five and the needle was low and I wrote down what I saw, and what I saw was small."

He entered twelve readings on a field sheet. Beside each, in the left-hand column, he entered the switch position, because the card taped to the lid told him to.

That column is the story.

Who did the arithmetic

The figures that have circulated since 1983 do not come from the handwritten sheet, which has never been found. They come from a typed four-page extract of it, in the papers of a researcher who died in 2011, now in a university library in the east of England.

The extract has no switch column.

Somebody, transcribing, lifted the dial figures off the sheet and converted every one as though it had been taken on ×10. The routing slip stapled to the front carries the name of a captain in the wing's disaster-preparedness section, Howard Prine, dead since 2009.

The factor between ×0.5 and ×10 is twenty.

Converted the way the extract converts it, the peak becomes 1.00 milliroentgens per hour — ten times the 0.1 the Halt memo gives as the site figure, which is where the phrase ten times background comes from, and it has been in every book on this case for forty years.

Read on the range written beside it, the same needle position is 0.05.

The survey nobody cited

In 2011 the Forestry Commission ran a soil survey across that plantation compartment for a felling licence, 41 sample points. Nobody in this argument has ever cited it, because it is a document about soil.

It gives a terrestrial dose rate of 0.03 to 0.11 milliroentgens per hour.

The corrected peak, at 0.05, sits inside that. So does the second reading at 0.045 and the third at 0.035. Dr. Priya Achterberg-Nwosu, who sampled the clearing for this newspaper in May, has checked the conversion and confirms it. She has also asked us to stop quoting the survey mean, which is a fact about a plantation, not a clearing.

There is no anomaly in these readings. There never was one. There was a needle sitting low on a range, and a man who wrote down where it sat.

What the meter cannot tell us

Vernon Threadgill-Sasaki calibrated these sets for twenty-five years and wants one thing said against this column.

An instrument fourteen months overdue is not a wild instrument. It is usually a tired one, and a tired one of this type reads low. The corrected figures may therefore be under the truth, and nobody can say by how much: 27J-4471 was surveyed off inventory in 1987 and destroyed.

That is where the physics stops, short of an answer, as it usually does.

What it costs to hold the meter

Bilyeu has been named in nine books. Roughly half have him inventing a reading. The rest have him standing four feet from something.

He has never said either. Since a local paper found him in 1994 he has said the same sentence in the same flat voice: the meter was not reading much.

He also says this column has a sentence wrong, he is probably right, and we have printed his objection below rather than quietly amending the paragraph. Our note of the March interview says he switched the range himself. He says the set was handed to him already on ×0.5. The distinction matters to him because our version makes him quick and his makes him ordinary.

The desk's view is narrow. A nineteen-year-old, nineteen hours into a shift in a wet plantation in December, recorded a measurement correctly and recorded the conditions beside it. Everything since has happened to somebody else's typewriter.

There is no cover-up in this file. There is a captain in a warm office doing a conversion he had no reason to think twice about, and a filing system that dropped one column, and a man in Lincolnshire who answers his door.