All In Call correct in this situation ?

[Thales]

The following hand i have played in the Moneymaker Promotion. I myself have played only 2 or 3 tournament seriously because i have got a token or a free ticket. This hand has me shown the difference between a cash game and a tournament game and was for me the most interesting in the tournament. I am not sure about the call. The problem is that when i call i risk the half of my stack. Before the call my stack was a litte about the average at that time. When i lose i am not in a very good position (M <10) and i can prepare an All In. I had no reads about my opponent. This was my 4th hand on this table. (He was a tight player - too tight for a tournament and left it earlier than i did).

PokerStars No-Limit Hold'em Tourney, Big Blind is t200 (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

<font color="#C00000">Hero (t5720)</font>
<font color="#C00000">MP1 (t3544)</font>
MP2 (t2882)
MP3 (t7525)
CO (t9990)
Button (t5880)
SB (t11960)
BB (t3841)
UTG (t9564)

Preflop: Hero is UTG+1 with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t1000</font>, <font color="#CC3333">MP1 raises to t3544</font>, <font color="#666666">6 folds</font>, Hero calls t2544.

Flop: (t7388) 2[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>

Turn: (t7388) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>

River: (t7388) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>

Final Pot: t7388

Results in white below: <font color="#FFFFFF">
Hero has Kd Ac (high card, ace).
MP1 has Ah As (one pair, aces).
Outcome: MP1 wins t7388. </font>