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When I understood your system then you should make it like this:

PHP код:

//under the includes:
new RadiationPlayer[MAX_PLAYERS],RadiationTimer[MAX_PLAYERS];
//your callback
public OnPlayerEnterDynamicArea(playerid, areaid) {
    for (new zone=0; zone<MAX_ZONES; zone++) {
        if (areaid==zones[zone]) {
            new msg[90];
            format(msg, 90, "Welcome to %s", zones_text[zone]);
            SendClientMessage(playerid, 0xFFFFFFFF, msg);
            RadiationTimer[playerid] = SetTimerEx("OnPlayerRadiationSystem",1000,1,"ii",playerid,areaid);
        }
    }
    return 1;
}
//callback for the timer
forward OnPlayerRadiationSystem(playerid,areaid);
public OnPlayerRadiationSystem(playerid,areaid)
{
    if(IsPlayerInDynamicArea(playerid,areaid))
    {
        RadiationPlayer[playerid] += 10;
        if(RadiationPlayer[playerid] == 100)
        {
            SetPlayerHealth(playerid,0.0);
            SendClientMessage(playerid,-1,"Your Radiation is on 100! You die!");
            return 1;
        }
        new string[50];
        format(string,sizeof string,"RADIATION: + 10 (current: %d)",RadiationPlayer[playerid]);
        SendClientMessage(playerid,-1,string);
    }
    return 1;
}
//your callback
public OnPlayerLeaveDynamicArea(playerid, areaid) {
    for (new zone=0; zone<MAX_ZONES; zone++) {
        if (areaid==zones[zone]) {
            new msg[90];
            format(msg, 90, "Goodbye from %s", zones_text[zone]);
            SendClientMessage(playerid, 0xFFFFFFFF, msg);
            KillTimer(RadiationTimer[playerid]);
        }
    }
    return 1;
}