SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-10.1, 2014-08-14, 15:53:53, 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=7981, y=1422, z=2697
primary beam = -1.8nA
QT1 Y defl = -1716 bits; QT1 Z defl = 385 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 195.82029 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97829 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02329 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98268 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98768 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99068 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06960 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04515 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05272 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18549   18943   19392   19743   20361   20204  
Pb204 4   1   3   1   0   1  
Bkgrnd 0   0   1   0   0   0  
Pb206 2855   2720   2750   2632 R 2593   2665  
Pb207 690   694   599   660   655   653  
Pb208 777   735   728   727   744   717  
U238 2543   2529   2662   2629   2693 R 2744  
ThO248 15757   15748   15690   15883   15745   16034  
UO254 7370   7470   7366   7567   7602   7443  
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 1.8 0.9 0.2 1.3 2.0 0.4 0.5 0.7 1.2
slope 2.4 -0.0 -0.0 -0.3 -0.0 -0.1 0.3 0.3 0.2
interc 1.9E+4 3.2E+0 2.5E-1 2.8E+3 6.8E+2 7.6E+2 2.5E+3 1.6E+4 7.4E+3
cps 9.8E+3 1.5E-1 1.6E-2 2.7E+2 2.2E+1 7.4E+1 5.2E+2 3.2E+3 3.7E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000507 0.081286 0.273879 18.775099 0.516739 6.035707 7.124356
ratio 0.000187 0.001986 0.004803 0.166656 0.006218 0.051867 0.067391

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01018(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1987 0.0045 1168.2023 23.9  
Pb207/Pb206 0.0813 0.0020 1228.3599 47.2  
Pb207/U235 2.2267 0.0783 1189.4779 24.3  
Pb208/Th232 0.0577 0.0018 1133.4685 34.4  
204 corrected          
Pb206/U238 0.1971 0.0045 1159.5248 24.0  
Pb207/Pb206 0.0741 0.0035 1043.6747 92.8  
Pb207/U235 2.0129 0.1108 1119.8559 36.7  
Pb208/Pb206 0.2579 0.0083      
Pb208/Th232 0.0539 0.0022 1060.5455 42.8  
207 corrected          
Pb206/U238 0.1980 0.0045 1164.8303 24.0  
Pb208/Pb206 0.2677 0.0070      
Pb208/Th232 0.0562 0.0021 1105.1507 39.5  
208 corrected          
Pb206/U238 0.1996 0.0045 1172.9432 24.2  
Pb207/Pb206 0.0852 0.0036 1319.5654 79.3  
Pb207/U235 2.3436 0.1175 1225.6277 35.1  

CONCENTRATIONS
CONCENTRATIONS U:63.6 ppm Th:60.0 ppm Th/U:0.943 ±0.0 Pb204:5.5 ppb sens 17.3