CRJ200 CREW RPTED THE SMOKE CARGO WARNING ILLUMINATED INFLT. EMER DECLARED.

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DEPARTED BOS RWY 22R. WITHIN 1 MIN OF TKOF; A 'SMOKE CARGO' WARNING PRESENTED. THE WARNING CEASED AFTER 3-5 SECONDS. THE WARNING RETURNED AFTER 20-30 SECONDS. FO WAS DIRECTED TO ASSUME THE CTL OF THE RADIOS. HE ENGAGED THE AUTOPLT. CAPT PERFORMED THE QRH CHKLIST FOR SMOKE CARGO WARNING. EMER DECLARED. ATC VECTORED FLT FOR IMMEDIATE RETURN TO LAND ON RWY 27. COMMUNICATED CIRCUMSTANCE WITH FLT ATTENDANT; ASKED FOR STATUS OF CABIN. NO PRESENCE OF SMOKE; FLAME OR ODOR RPTED BY FLT ATTENDANT. UNEVENTFUL LNDG PERFORMED BY FO. ACFT TAXIED CLR OF LNDG RWY ONTO TXWY W. PAX EVAC INITIATED UTILIZING ONLY MAIN CABIN DOOR. PAX DIRECTED TO CONGREGATE FORWARD AND UPWIND OF ACFT. CFR INFORMED OF PRESENCE OF HALON VAPOR IN CARGO COMPARTMENT. EVAC WAS ORDERLY WITH NO ADVERSE CIRCUMSTANCES OR INJURIES NOTED. ACFT WAS SECURED. FO PERFORMED FLAWLESSLY. STRONG ASSET TO THE SUCCESSFUL OUTCOME OF THIS CIRCUMSTANCE. FLT ATTENDANT PERFORMED IDEALLY. REMAINED CALM AND CALMED THE PAX EFFECTING; A CALM AND ORDERLY EVAC. ATC DEP TWR; AND THEN GND; PROVIDED RAPID; ACCURATE HELP -- ANOTHER STRONG ASSET. CFR WAS WAITING FOR US. MET ACFT AS WE STOPPED AND ASSISTED WITH EVAC. SUPPLEMENTAL INFO FROM ACN 627347: CAPT DID AN INCREDIBLE JOB. HE PERFORMED THE MEMORY ITEMS AND QRH PROPERLY. HE THEN KEPT THE FLT ATTENDANT IN THE LOOP. CAPT ASSISTED ME IN CONFIGURING THE AIRPLANE. HE WAS CALM AND KNEW EXACTLY WHAT TO DO; AND HIS COMMAND PRESENCE WAS NEVER IN DOUBT. THE FLT ATTENDANT DID A WONDERFUL JOB OF KEEPING CALM AND PORTRAYING THIS TO THE PAX. SHE DID HER DUTIES FLAWLESSLY. THE CFR WAS PROMPT AND WAITING FOR US. ATC DID A WONDERFUL JOB OF GETTING US BACK.