SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-5.1, 2014-08-14, 13:40:37, 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=1508, z=2420
primary beam = -1.8nA
QT1 Y defl = -1755 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 195.81718 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97518 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02018 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.97974 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98474 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98774 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06634 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04166 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04764 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18549   18326   19843   20234   20722   21063  
Pb204 2   2   1   0   0   2  
Bkgrnd 1   0   0   0   2   0  
Pb206 1878   1890   1909   1826   1858   1718  
Pb207 438 R 480   463   452   450   416  
Pb208 867   867   892   789   787   862  
U238 1664   1764   1846   1938   1848   1883  
ThO248 17717   17694   18027   18233   18314   18013  
UO254 5032   4966   5146   5167   5189   5147  
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 1.0 0.3 0.3 1.4 1.0 2.4 2.3 2.0 0.8
slope 3.3 -0.0 0.0 -0.2 -0.0 -0.1 0.3 0.7 0.2
interc 1.9E+4 1.7E+0 4.2E-1 1.9E+3 4.7E+2 8.8E+2 1.7E+3 1.8E+4 5.0E+3
cps 1.0E+4 1.1E-1 5.0E-2 1.8E+2 1.5E+1 8.5E+1 3.6E+2 3.6E+3 2.5E+3
rej1 18326                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000334 0.081115 0.458617 27.797441 0.511126 9.936421 7.040376
ratio 0.000264 0.001809 0.011281 0.412274 0.009383 0.150752 0.109944

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01031(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2012 0.0073 1181.9448 39.0  
Pb207/Pb206 0.0811 0.0018 1224.2252 43.2  
Pb207/U235 2.2506 0.1010 1196.9795 31.1  
Pb208/Th232 0.0589 0.0029 1156.3442 54.9  
204 corrected          
Pb206/U238 0.2002 0.0073 1176.1758 39.1  
Pb207/Pb206 0.0764 0.0045 1105.2291 112.7  
Pb207/U235 2.1081 0.1532 1151.4637 48.9  
Pb208/Pb206 0.4491 0.0149      
Pb208/Th232 0.0574 0.0031 1127.1624 59.0  
207 corrected          
Pb206/U238 0.2008 0.0073 1179.5546 39.0  
Pb208/Pb206 0.4547 0.0122      
Pb208/Th232 0.0582 0.0029 1144.2553 55.7  
208 corrected          
Pb206/U238 0.2024 0.0075 1188.3577 40.3  
Pb207/Pb206 0.0863 0.0085 1345.2737 179.6  
Pb207/U235 2.4092 0.2645 1245.3353 75.9  

CONCENTRATIONS
CONCENTRATIONS U:42.6 ppm Th:66.8 ppm Th/U:1.567 ±0.0 Pb204:2.5 ppb sens 16.8