FLT CREW FAILED TO TURN OFF ACFT RADAR AFTER ARR AT PBI. CGP COMPLAINED OF HEADACHE AND TAKEN TO HOSPITAL FOR OBSERVATION; THEN RELEASED.

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AFTER ATC SLOWDOWNS; HOLDING; MARGINAL DEST WX AND CONTINUAL UPDATING WITH DISPATCH; WE PROCEEDED TO AN UNEVENTFUL APCH AND LNDG AT PBI. RAIN WAS STILL HEAVY AT THE ARPT WITH TSTMS IN THE VICINITY. ACFT WAS CLRED OFF THE RWY AND TAXIED TO THE RAMP. THE CAPT WAS BUSY TAXIING ACFT IN REDUCED VIS. THE F/O WAS BUSY MANIPULATING THE WINDSHIELD WIPER CTLS AND LOOKING FOR THE GATE DIRECTORS; AND THE S/O WAS BUSY CONTACTING OPS. THE AFTER LNDG CHKLIST WAS CALLED FOR AND COMPLETED. THE ACFT WAS PARKED AND THE PARKING CHKLIST COMPLETED. UPON ARR AT LAYOVER HOTEL; OPS INFORMED ME THAT MAINT HAD FOUND THE RADAR ON AND THAT ONE OF THE ACFT HANDLERS HAD BEEN EXPOSED TO RADAR ENERGY AND WOULD BE GOING TO THE HOSPITAL FOR A CHECKUP. I INTERVIEWED THE F/O AND S/O RE THEIR CHALLENGE AND RESPONSE DUTIES ON THE AFTER LNDG CHKLIST. THE F/O REMEMBERED GOING THROUGH THE MOTIONS OF RADAR TO STANDBY; BUT CAN'T DEFINITELY REMEMBER THE EXACT RADAR MODE SWITCHING; ALTHOUGH HE COMMENTED THAT THE RADAR SCOPE APPEARED DARK. THE S/O REMEMBERS THAT SCOPE ALSO APPEARED DARK. THIS PARTICULAR RADAR WAS A DIFFERENT LAYOUT AND SWITCHOLOGY THAN BOTH THE F/O AND S/O WERE TYPICALLY FAMILIAR WITH AND MAY HAVE LED TO INCORRECT RADAR MODE SWITCHING. WITH ALL THE COCKPIT CREW MEMBERS PERFORMING VARIOUS DUTIES DURING THE ACFT MOVEMENT AND THE RELIEF THAT A LONG; DEMANDING FLT WAS OVER; THE RADAR MODE SELECTOR MAY HAVE BEEN MISREAD OR MISSELECTED ON THE AFTER LNDG CHKLIST. FACTORS INVOLVED: DEMANDING; STRESSFUL FLT AND DIFFERENT COCKPIT RADAR LAYOUT AND SWITCHOLOGY THAN TYPICALLY FAMILIAR WITH. SUPPLEMENTAL INFO FROM ACN 86987: THE WINDSHIELD WIPERS IN THIS ACFT TYPE ARE NOTORIOUSLY LOUD AND QUITE DISTRACTING. DURING THE TAXI; THE F/O OPERATED THE WIPERS WHILE HE AND I COMPLETED THE AFTER LNDG CHKLIST. I SAW HIM TOUCH THE RADAR MODE SELECTOR. THE SCREEN LOOKED DARK AND APPEARED TO BE IN STANDBY; HOWEVER I CANNOT REMEMBER WHAT THE SCREEN LOOKED LIKE IN FLT (THE AZIMUTH LINES MAY HAVE BEEN DIMMED OUT).