SUPER 80 FLC ENCOUNTERS TURB AT ALT AND ATTEMPTS TO FIND A SMOOTHER RIDE.

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LOCATION; SAX. DURING CLBOUT FROM BOSTON WE RECEIVED NUMEROUS MESSAGES FROM ATC; ACFT AND DISPATCH CONCERNING RPTS OF TURB ABOVE FL270. WE CHOOSE TO REMAIN AT FL240 UNTIL WE CLRED THE AREA OF THE RPTS. THE RIDE WAS MOSTLY SMOOTH WITH BRIEF; ISOLATED AREAS OF MODERATE CHOP. DESPITE THE RELATIVELY GOOD RIDE I LEFT THE SEAT BELT SIGN ON AND MADE A COUPLE OF PA'S TO MAKE SURE THAT ALL THE PAX REMAIN SEATED. THE #1 ALSO REPEATED MY WARNINGS. AFTER A PERIOD OF RELATIVE CALM THE COACH FLT ATTENDANTS BEGAN A LIMITED SVC. JUST AFTER THEY STARTED WE PASSED OVER SAX AT FL240 AND 300 KTS. WE ENCOUNTERED MODERATE TO SEVERE TURB FOR 1.5-2 MINS. THE AUTOPLT DISCONNECTED AND THE FO WAS ABLE TO MAINTAIN ALT PLUS AND MINUS 300 FT AND AIRSPD WITHIN 20 KTS. WE RECEIVED CLRNC AND DSNDED TO FL220 WHERE THE RIDE IMPROVED. DUE TO THE SEAT BELT SIGN AND MANY WARNINGS ALL THE PAX WERE BUCKLED-IN AND NO ONE WAS HURT. THE COACH FLT ATTENDANTS WERE ABLE TO GET INTO SEATS AND STRAP IN. ONE HAD TO BE RESTRAINED TO PREVENT HER FROM HITTING THE CEILING. ANOTHER WAS BRUISED ON THE THIGH LNDG ON A REST. THE THIRD MAY HAVE TWISTED HIS BACK AND SHOULDER AS HE GRABBED A LOOSE CART FROM FLYING FORWARD. ALL THE FLT ATTENDANTS WERE ABLE TO CONTINUE THE FLT BUT WE REQUESTED THAT ON ARR THEY GET CHKED OUT AT DFW MEDICAL. ALL THE PAX SEEMED TO BE IN GOOD SPIRITS AFTER RIDE SMOOTHED OUT.