SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-3.1, 2014-08-14, 12:43:32, 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=1527, z=2280
primary beam = -1.8nA
QT1 Y defl = -1737 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 195.81693 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97493 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.01993 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98003 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98504 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98804 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06583 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04240 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04811 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18845   19616   20021   20491   20908   20632  
Pb204 0   1   0   0   0   0  
Bkgrnd 0   1   1   0   0   0  
Pb206 1520   1584   1551   1549   1508   1510  
Pb207 433   381   398   342 R 357   366  
Pb208 534   511   477   457   484   452  
U238 1523   1522   1512   1589   1547   1560  
ThO248 10697   10604   10463   10474   10514   10420  
UO254 4469   4313   4328   4299   4185   4178 R
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 0.7 0.1 0.2 0.5 1.5 0.7 0.4 0.4 0.4
slope 3.3 -0.0 -0.0 -0.1 -0.1 -0.1 0.1 -0.3 -0.3
interc 1.9E+4 4.0E-1 6.5E-1 1.6E+3 4.2E+2 5.3E+2 1.5E+3 1.1E+4 4.5E+3
cps 1.0E+4 1.5E-2 3.2E-2 1.5E+2 1.3E+1 4.9E+1 3.1E+2 2.1E+3 2.2E+3
rej1 20632                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000112 0.082579 0.318910 33.125201 0.499634 6.861570 7.032936
ratio -0.000194 0.002299 0.006782 0.357448 0.007354 0.076399 0.085256

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01010(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1971 0.0056 1159.8611 30.0  
Pb207/Pb206 0.0826 0.0023 1259.2874 53.5  
Pb207/U235 2.2445 0.0946 1195.0592 29.2  
Pb208/Th232 0.0580 0.0023 1140.1721 43.3  
204 corrected          
Pb206/U238 0.1975 0.0056 1161.7601 30.3  
Pb207/Pb206 0.0841 0.0038 1296.0126 84.7  
Pb207/U235 2.2913 0.1284 1209.5932 38.9  
Pb208/Pb206 0.3223 0.0097      
Pb208/Th232 0.0588 0.0026 1154.0286 50.0  
207 corrected          
Pb206/U238 0.1962 0.0056 1155.0616 30.1  
Pb208/Pb206 0.3102 0.0090      
Pb208/Th232 0.0562 0.0025 1105.1284 47.1  
208 corrected          
Pb206/U238 0.1977 0.0057 1163.0196 30.5  
Pb207/Pb206 0.0852 0.0049 1319.8268 108.4  
Pb207/U235 2.3223 0.1576 1219.1214 47.1  

CONCENTRATIONS
CONCENTRATIONS U:35.7 ppm Th:38.7 ppm Th/U:1.083 ±0.0 Pb204:-0.7 ppb sens 17.5