Fairfax County's school superintendent yesterday recommended that the newly created Jefferson High School for Science and Technology be open to students from other jurisdictions in Northern Virginia, but said he may have a hard time getting school board members to go along with that recommendation.

Superintendent William J. Burkholder said letting students other than those in the county attend is in line with the state's wish to transform Jefferson into a regional "magnet" school.

However, Burkholder acknowledged yesterday that some school board members favor making the school open only to in-county students, and it is not clear that the school board will go along with his proposal when it takes action on the question on Oct. 11.

"As it looks now," Burkholder said, "it is not likely that the board will accept designation as a regional school."

The regional designation would mean the school would have to accept students not only from Fairfax, but from Arlington, Loudoun and Prince William counties, as well as the cities of Alexandria, Falls Church, Manassas and Manassas Park.

If the school board ignores Burkholder's plan and votes to make Jefferson open only to Fairfax County students, it would forfeit $242,000 in state funding for the school in the first year.

The school is scheduled to open in August 1985. Burkholder has urged that the deadline for applications be Dec. 17 this year.

Burkholder's recommendations yesterday included the first specific proposals for the school's enrollment, curriculum and staffing.

Faculty at the school would receive a 7 percent salary increase because the workday at the school would be a half-hour longer than the normal 7 1/2 hours. There would also be 20 days of summer employment with extra pay for teachers assigned to the school. A teacher who made $25,499 at a regular school would earn $30,156 at Jefferson, according to Burkholder's proposal.

The superintendent further urged that 400 ninth-graders be admitted for the first year after completing an entrance examination. School officials expect more than 1,000 applicants for the school in the first year. Two hundred seniors would be admitted to the school for a special one-year program.

Burkholder also recommended that graduation requirements be set at 25 credits, including a total of 10 in mathematics, science and computer science.

In addition, students would be required to complete three years of one foreign language, mathematics through calculus and a four-year science sequence.

In March, the Virginia General Assembly voted to create four "magnet" schools -- three for science and technology and one for the arts.

The other two science schools will be in Roanoke and the Norfolk area; the arts school also will be in the Norfolk area.

The school board will have a chance to discuss Burkholder's proposals preliminarily on Sept. 6, with final action scheduled the next month.