SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRB-6.1, 2014-08-14, 18:47:28, 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=7995, y=1733, z=3741
primary beam = -1.7nA
QT1 Y defl = -1699 bits; QT1 Z defl = 400 bits
runtable 2014-08-14 GSWA 0955
duration: 15min 28sec (928sec)


RUN TABLE
# Name AMU AMU Offset Time s Delay s Coll Focus Centering Ref Cent Detector CUP Mode setting
1 Zr2O 195.82203 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98002 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02502 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98495 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98995 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99295 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07071 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04817 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05438 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18813   18938   19694   20331   20458   20239  
Pb204 2   0   1   1   1   1  
Bkgrnd 3   0   1   0   0   0  
Pb206 18018   17914   17525   17362   16897   16932  
Pb207 3222   3079   3245   3162   2993 R 3032  
Pb208 1165   1185   1161   1260   1074   1146  
U238 37135   37737   38145   38679   38919   39500  
ThO248 54162   53707   54385   53337   54373   54586  
UO254 107939   107659   106872   105741 R 108753   106878  
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 2.3 0.1 0.1 0.8 2.4 3.5 0.2 1.4 1.3
slope 3.0 -0.0 -0.0 -1.6 -0.2 -0.1 3.0 0.8 -1.6
interc 1.9E+4 1.2E+0 2.0E+0 1.8E+4 3.2E+3 1.2E+3 3.7E+4 5.4E+4 1.1E+5
cps 1.0E+4 9.9E-2 6.1E-2 1.7E+3 1.0E+2 1.2E+2 7.6E+3 1.1E+4 5.4E+4
rej1 20239             53337 108753
rej2                 105741

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000022 0.059741 0.066928 1.311740 0.228568 1.420181 7.028908
ratio 0.000034 0.000695 0.001512 0.006363 0.000852 0.004144 0.017633

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00463(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0903 0.0006 557.2080 3.3  
Pb207/Pb206 0.0597 0.0007 594.1902 25.0  
Pb207/U235 0.7437 0.0103 564.5391 6.0  
Pb208/Th232 0.0269 0.0006 537.2482 12.6  
204 corrected          
Pb206/U238 0.0903 0.0006 557.0223 3.3  
Pb207/Pb206 0.0594 0.0009 582.7596 31.6  
Pb207/U235 0.7395 0.0123 562.1104 7.2  
Pb208/Pb206 0.0662 0.0019      
Pb208/Th232 0.0266 0.0008 531.1051 15.9  
207 corrected          
Pb206/U238 0.0902 0.0006 556.6094 3.4  
Pb208/Pb206 0.0645 0.0023      
Pb208/Th232 0.0259 0.0009 517.4425 18.5  
208 corrected          
Pb206/U238 0.0904 0.0006 557.8313 3.4  
Pb207/Pb206 0.0608 0.0010 631.9029 34.2  
Pb207/U235 0.7576 0.0136 572.6472 7.8  

CONCENTRATIONS
CONCENTRATIONS U:902.0 ppm Th:202.3 ppm Th/U:0.224 ±0.0 Pb204:1.5 ppb sens 17.9