If Mayor Marion Barry's appeal of the sentence he received yesterday is unsuccessful, he would be required to serve the full six months of his prison term and most likely would be incarcerated at a minimum-security facility, federal officials said.

Barry, they said, stands a significant chance of being sent to one of the two nearest federal "camps," in Allenwood, Pa., or Petersburg, Va., where he would sleep in a bunk bed, rise at 6 a.m. and punch a clock at one of the prison industries.

Theoretically, U.S. Bureau of Prisons officials could decide to send Barry to one of the two federal halfway houses in the District, but legal and prison experts characterized that prospect as unlikely because U.S. District Judge Thomas Penfield Jackson did not specifically order such a placement in passing sentence.

Jackson also ordered Barry to pay a $5,000 fine, plus the cost of his six months' incarceration and one year of supervision after his release.

Federal sentencing guidelines require judges to charge defendants for their incarceration if the defendant can afford it.

Barry will be required to pay $9,653 in addition to his fine, according to figures provided by Paul Martin of the U.S. Sentencing Guidelines Commission. The monthly prison cost is $1,415.56 and the monthly supervision cost is $96.66.

Barry is not eligible for any time off from his sentence because parole was abolished by the federal sentencing commission.

Before any decision is made about Barry's placement, his case will be reviewed by prison bureau officials who will rank Barry according to a variety of factors, including his age, the seriousness of his offense and his security risk to the community. Daniel Dunne, a spokesman for the U.S. Bureau of Prisons, said Barry most likely would get a "minimum" ranking.

Prisoners given this ranking are placed in one of 17 minimum-security facilities across the country. The proximity of such camps to the defendant's home is a significant factor in choosing a placement.

If Barry is sent to Allenwood, he would be assigned a bunk bed in one of 14 dormitories and live a structured life; rising at 6 a.m. for breakfast and working until 3:45 with a break for lunch. More than half the inmates work in the facility's industrial furniture branch.

No conjugal visits are allowed at Allenwood or Petersburg, Dunne said.

Barry also would be assigned a bunk bed if sent to the Petersburg facility, which is about 25 miles southwest of Richmond.

The 260 inmates there sleep four to a room or live in dormitories. Most work in the facility's electronic cable factory.

Dunne said it was "not fair" to compare the facilities to a country club, as the prison at Allenwood sometimes is described.

"It is definitely not the kind of place you'd want to go on your vacation," he said.