MCNP4C: efficiency calculation

[lingleo]

Any one familiar with MCNP4C efficiency calculation can help me with this?
My cal. result for 1.836MeV(e.g.) is always small (6.16447E-05 ) compared to it should be(3.78E-004 by a professional business software), here is the inp file, is there anything wrong with the geometry define or source or tally card?
Thank you very much!
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---Cal of NaI sensitivity to be compared with Labsocs results
c cells
1 1 1.0 (1 -7 -12)#(1 -6 -11) imp:P=1
2 2 -7.86 (1 -6 -11)#(1 -5 -10) imp:P=1
3 3 -3.67 3 -4 -9 imp:P=1
4 4 -2.7 (2 -5 -10)#3 imp:P=1
5 5 -1.293e-3 -14 #1#2#3#4 imp:P=1
6 0 14 IMP:P=0

c surfaces(cm)
1 PY 0
2 PY 19.2
3 PY 19.56
4 PY 24.64
5 PY 25
6 PY 26
7 PY 41
9 CY 2.54
10 CY 2.9
11 CY 3.9
12 CY 20
14 SY 20.5 30

mode P
sdef cel=1 erg=D1 pos=0 0 0 axs=0 1 0 rad=D2 ext=D3 EFF=0.01
c for comparement
SI1 L 1.83608
c SI1 L 1.33249
c SI1 L 1.17322
c SI1 L 0.898
c SI1 L 0.66165
c SI1 L 0.514
SP1 D 1
SI2 0 20.6
SI3 -0.1 41.1
c M1 is H2O
M1 1001 0.6667 8016 0.3333 92235 0.966e-6
c M2 is Fe
M2 26056 1
c M3 is NaI
M3 11023 0.5 53127 0.5
c M4 is Al
M4 13027 1
c M5 is air
M5 8016 -0.231 7014 -0.7506 18040 -0.1286
F8:P 3
E8 0 1e-5 1 10I 1.8355 7I 1.8362
c E8 0 1e-5 1 10I 1.3321 7I 1.3328
c E8 0 1e-5 1 10I 1.1725 9I 1.1735
c E8 0 1e-5 0.1 10I 0.891 9I 0.901
c E8 0 1e-5 0.1 10I 0.510 9I 0.515
c E8 0 1e-5 0.1 10I 0.3910 9I 0.3920
c E8 0 1e-5 0.05 10I 0.3195 9I 0.3205
c E8 0 1e-5 0.05 10I 0.1582 9I 0.1592
c E8 0 1e-5 0.1 10I 0.6612 9I 0.6622
c E8 0 1e-5 0.01 13I 0.14 40I 0.145 0.15
c E8 0 1e-5 0.14366 11I 0.14378.
c E8 0 1e-5 0.05 0.1 10I 0.2045 9I 0.2055
c E8 0 1e-5 0.05 0.1 0.1850 9I 0.1860
c T6 0 10I 660e8
c fq6 t e
CTME 20
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[Norman]

This is a bad place to post this. I would suggest going to the MCNP forums:

http://www-xdiv.lanl.gov/x5/MCNP/forum.html