WASHINGTON (Reuters) - Confessed Unabomber Ted Kaczynski says his brother David, who turned him in for sending package bombs that killed 3 people and injured 23 across the United States, should have kept quiet about his suspicions, according to an interview published Sunday in Time magazine.

Kaczynski, now serving a life sentence in a high security federal prison in Colorado, also says he hopes he will die soon because imprisonment is unbearably humiliating.

Nicknamed the ``Unabomber'' by the Federal Bureau of Investigation (FBI) because the early targets of his 18-year bombing campaign were universities and airlines, Kaczynski pleaded guilty last year to five bombings.

He was arrested at his remote Montana shack after David Kaczynski and his wife, Linda Patrik, tipped authorities. They had recognized Ted's sentiments in a manifesto published by the Washington Post and The New York Times.

Kaczynski, who has refused to speak to his brother and pointedly ignored him in court, told Time he thought his brother was wrong to have turned him in. ``I would have kept it to myself,'' he said.

In a book, due to be published soon under the title ``Truth Versus Lies,'' Kaczynski writes, ``He knows very well that imprisonment to me is an unspeakable humiliation and that I would unhesitatingly choose death over incarceration.''

In the interview, Kaczynski adds, ``I don't want to live long. I would rather get the death penalty than send the rest of my life in prison.''

Between the book and the interview, Kaczynski paints a picture of both himself and his brother as troubled young men who had trouble adjusting socially.

While David and Patrik say they believe Kaczynski is insane, he declares his own mental abilities are sound.

``I'm confident that I'm sane,'' he is quoted by Time as saying.

``I don't get delusions and so forth ... I had very serious problems with social adjustment in adolescence, and a lot of people would call this a sickness. But it would have to be distinguished (from) an organic illness, like schizophrenia or something like that.''

Kaczynski says he pleaded guilty only to stop his lawyers from pleading insanity on his behalf.

Saying he is kept in a bloc of eight cells known as ''Celebrity Row', Kaczynski describes his neighbors, who include Timothy McVeigh, convicted of the 1995 Oklahoma City bombing in which 168 people died, as ``considerate.''

``These people are not what you would think of as criminal types,'' he said. ``I mean, they don't seem to be very angry people. They're considerate of others. Some of them are quite intelligent.''