CTLR ISSUED RADAR VECTOR HDG WHICH PLACED ACR X BELOW MVA. OPDEV.

Narrative

I CLRED ACR X FOR TKOF FROM RWY 16R. AT THE DEP END OF THE RWY; I TURNED THE ACFT TO HDG 240 DEG DUE TO VFR TFC TO HIS N; ALSO WBOUND AND HIS SLOW CLB RATE. (STANDARD HDG IS 380 DEG FOR ALL IFR DEPS OFF RWYS 16R AND 16L THAT ARE FILED W -- THROUGH SEBOUND. THE ACFT WAS TOLD TO REMAIN ON MY FREQ. WHILE I WAITED FOR THE ACR X TO GAIN MORE ALT (HE WAS CLRED TO MAINTAIN 8000 FT MSL); I WAS DISTRACTED BY A VFR SMA WHOM I HAD LOST RADIO CONTACT WITH APPROX 1 MIN AFTER TURNING ACR X TO 240 DEG; THE PLT RPTED 'OUT OF 7300 FOR 8000.' I NOTICED THE ACFT WAS ABOUT 2 OR 3 MI FROM ENTERING AN 11000 FT MVA AREA. I GAVE ACR X AN 'IMMEDIATE R TURN HDG 280 DEG' AND TOLD HIM TO CONTACT DEP CTL. THE HDG DIDN'T TAKE THE ACFT FAR ENOUGH N AND IT ENTERED THE HIGHER MVA 1 MIN LATER. THE MAJOR CONTRIBUTING FACTOR WAS THE NORDO ACFT WHICH CAUSED ME TO STOP DEPS UNTIL I COULD ENSURE THE ACTIONS THAT ACFT WOULD TAKE. WITHOUT MY ATTN BEING DIVERTED; ACR X WOULD HAVE GOTTEN THE TURN TO 280 DEG IN TIME TO MISS THE HIGHER MVA. THERE IS A GREAT DEAL OF EMPHASIS PUT ON THE IMPORTANCE OF CTLRS MAINTAINING A GOOD VISUAL SCAN OF THE WORK ENVIRONMENT. HOWEVER; I WAS DISTRACTED. THEREFORE; I REALLY HAVE NO HELPFUL SUGGESTION. THE EMPHASIS IS ALREADY THERE.