SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-14.1, 2014-08-15, 08:41:24, set 1 of 1
6 scans, 25 nano seconds dead time, RATIO TO SBM ON, SBM zero 23557, autocenter ON, trim mass offset disabled
data reduction Zircon, BR266, spot x=7985, y=2237, z=2893
primary beam = -2.1nA
QT1 Y defl = -1712 bits; QT1 Z defl = 400 bits
runtable 2014-08-14 GSWA 0955
duration: 15min 27sec (927sec)


RUN TABLE
# Name AMU AMU Offset Time s Delay s Coll Focus Centering Ref Cent Detector CUP Mode setting
1 Zr2O 195.82476 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98276 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02776 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98769 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99269 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99569 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07361 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05042 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05673 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 20240   20339   21293   21770   22113   22254  
Pb204 1   3   1   2   0   1  
Bkgrnd 0   1   3   0   0   0  
Pb206 2110   1982   1918   1930   1821   1920  
Pb207 462   468   442   419   435   420  
Pb208 766   696   664   697   690   694  
U238 2125   2256   2219   2276   2373   2161  
ThO248 17231   17290   16713   17250 R 17148   16809  
UO254 6311   6173   6108   6111   6300   6295  
I - insufficient counts to center; C - fail to center; R - failed F test, passed by rejection F - failed F test, accepts all counts, S - re-measured

LINEAR REGRESSION (reject at 2 x cnt stat)
  Zr2O Pb204 Bkgrnd Pb206 Pb207 Pb208 U238 ThO248 UO254
F 2.8 0.5 0.4 2.2 0.3 1.5 3.8 3.7 1.8
slope 2.9 -0.0 -0.0 -0.3 -0.1 -0.1 0.1 -0.4 0.1
interc 2.0E+4 2.0E+0 1.1E+0 2.1E+3 4.7E+2 7.3E+2 2.2E+3 1.7E+4 6.2E+3
cps 1.1E+4 1.3E-1 6.4E-2 1.9E+2 1.5E+1 7.0E+1 4.5E+2 3.4E+3 3.1E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000326 0.075445 0.361414 24.097140 0.437018 7.677842 6.970871
ratio 0.000283 0.001793 0.008330 0.420985 0.009457 0.137287 0.127140

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00899(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1755 0.0074 1042.3713 40.7  
Pb207/Pb206 0.0754 0.0018 1080.3758 46.9  
Pb207/U235 1.8257 0.0934 1054.7212 33.0  
Pb208/Th232 0.0520 0.0028 1023.9639 54.5  
204 corrected          
Pb206/U238 0.1746 0.0074 1037.3423 40.7  
Pb207/Pb206 0.0708 0.0047 951.3845 130.9  
Pb207/U235 1.7041 0.1425 1010.0709 52.1  
Pb208/Pb206 0.3516 0.0132      
Pb208/Th232 0.0503 0.0031 991.7822 60.3  
207 corrected          
Pb206/U238 0.1752 0.0074 1040.6413 40.7  
Pb208/Pb206 0.3581 0.0095      
Pb208/Th232 0.0514 0.0029 1012.8961 55.5  
208 corrected          
Pb206/U238 0.1761 0.0076 1045.8189 41.3  
Pb207/Pb206 0.0786 0.0067 1162.3149 161.3  
Pb207/U235 1.9091 0.1921 1084.2542 64.9  

CONCENTRATIONS
CONCENTRATIONS U:48.8 ppm Th:59.6 ppm Th/U:1.221 ±0.0 Pb204:2.4 ppb sens 16.1