SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-6.1, 2014-08-14, 13:59:35, 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=7978, y=1467, z=2462
primary beam = -1.8nA
QT1 Y defl = -1722 bits; QT1 Z defl = 385 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 195.81668 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97468 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.01968 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98107 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98608 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98908 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06663 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04206 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04768 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18737   18683   19663   20369   20473   20989 R
Pb204 1   1   0   1   0   1  
Bkgrnd 1   0   1   0   0   0  
Pb206 1330   1304   1261   1235   1195   1221  
Pb207 360   320   326   331   320   281  
Pb208 509   496   501   480   477   461  
U238 1122   1151   1189   1283   1190   1238  
ThO248 9969   9900   10208   10082   9983   10319  
UO254 3473   3492   3573   3499   3460   3451  
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 3.8 0.1 0.1 0.3 0.8 0.1 1.6 1.9 0.6
slope 3.2 -0.0 -0.0 -0.2 -0.1 -0.1 0.1 0.3 -0.1
interc 1.9E+4 8.2E-1 8.2E-1 1.3E+3 3.6E+2 5.2E+2 1.1E+3 9.9E+3 3.5E+3
cps 1.0E+4 6.5E-2 3.1E-2 1.3E+2 1.1E+1 4.9E+1 2.4E+2 2.0E+3 1.7E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000272 0.085842 0.389490 42.099503 0.530334 8.474651 7.370404
ratio 0.000333 0.002189 0.008492 0.670654 0.009986 0.134970 0.121037

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00976(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1905 0.0072 1124.1688 38.9  
Pb207/Pb206 0.0858 0.0022 1334.6378 48.5  
Pb207/U235 2.2549 0.1087 1198.3278 33.4  
Pb208/Th232 0.0575 0.0028 1130.3777 54.1  
204 corrected          
Pb206/U238 0.1897 0.0073 1119.6747 39.2  
Pb207/Pb206 0.0820 0.0056 1245.7813 128.3  
Pb207/U235 2.1449 0.1767 1163.4116 55.5  
Pb208/Pb206 0.3814 0.0148      
Pb208/Th232 0.0561 0.0033 1102.9667 63.3  
207 corrected          
Pb206/U238 0.1886 0.0072 1113.7834 38.7  
Pb208/Pb206 0.3708 0.0103      
Pb208/Th232 0.0542 0.0028 1067.0061 54.2  
208 corrected          
Pb206/U238 0.1903 0.0073 1122.9364 39.5  
Pb207/Pb206 0.0848 0.0068 1310.8511 148.2  
Pb207/U235 2.2248 0.2073 1188.8691 63.3  

CONCENTRATIONS
CONCENTRATIONS U:29.0 ppm Th:37.4 ppm Th/U:1.290 ±0.0 Pb204:1.3 ppb sens 18.2