SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-2.1, 2014-08-14, 20:55:12, 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=2076, z=2524
primary beam = -1.8nA
QT1 Y defl = -1741 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 195.82464 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98263 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02763 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98857 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99358 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99658 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07460 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05051 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05739 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19396   20351   20570   20748 R 21348 R 21569  
Pb204 2   4   0   0   0   0  
Bkgrnd 1   1   0   1   0   0  
Pb206 2254   2245   2214   2208   2038   2143  
Pb207 537   523   452   504   520   484  
Pb208 1261   1297   1223   1146   1134   1107 R
U238 2672   2671   2649   2695   2821   2739  
ThO248 29482   29673   29194   29527   29147   27884 R
UO254 7349   7275   7240   7276   7140   7062  
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 2.4 0.3 0.1 1.6 2.2 0.8 0.9 1.6 0.3
slope 2.6 -0.0 -0.0 -0.2 -0.0 -0.2 0.2 -0.5 -0.3
interc 2.0E+4 2.7E+0 1.1E+0 2.3E+3 5.2E+2 1.3E+3 2.6E+3 3.0E+4 7.4E+3
cps 1.0E+4 8.5E-2 4.7E-2 2.2E+2 1.7E+1 1.2E+2 5.4E+2 5.9E+3 3.6E+3
rej1               27884  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000174 0.076774 0.552359 19.262543 0.404753 10.900688 6.722421
ratio 0.000174 0.002232 0.008910 0.173420 0.005462 0.091504 0.061854

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00896(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1748 0.0040 1038.4202 21.8  
Pb207/Pb206 0.0768 0.0022 1115.3221 57.0  
Pb207/U235 1.8502 0.0724 1063.5006 25.5  
Pb208/Th232 0.0541 0.0017 1065.7480 31.7  
204 corrected          
Pb206/U238 0.1743 0.0040 1035.7561 22.0  
Pb207/Pb206 0.0743 0.0035 1049.8755 91.9  
Pb207/U235 1.7858 0.0979 1040.3052 35.1  
Pb208/Pb206 0.5477 0.0110      
Pb208/Th232 0.0535 0.0018 1054.1127 33.8  
207 corrected          
Pb206/U238 0.1742 0.0040 1035.1977 21.9  
Pb208/Pb206 0.5467 0.0107      
Pb208/Th232 0.0534 0.0017 1051.6739 33.4  
208 corrected          
Pb206/U238 0.1733 0.0041 1030.1720 22.6  
Pb207/Pb206 0.0691 0.0068 901.7757 189.8  
Pb207/U235 1.6510 0.1710 989.9307 63.5  

CONCENTRATIONS
CONCENTRATIONS U:59.6 ppm Th:106.3 ppm Th/U:1.783 ±0.0 Pb204:1.6 ppb sens 16.3