SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-27.1, 2014-08-15, 06:39:36, 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=7991, y=1229, z=3524
primary beam = -1.9nA
QT1 Y defl = -1733 bits; QT1 Z defl = 400 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 195.82355 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98155 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02655 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98732 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99232 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99532 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07327 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05048 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05669 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19521   19920   20323   21168   21218   21512  
Pb204 2   0   3   0   2   0  
Bkgrnd 1   0   2   0   0   0  
Pb206 2010   1891   1827   1821   1875   1821  
Pb207 504   518   462   452   443   407  
Pb208 1013   969   975   962   964   908  
U238 1666   1797   1876   1883   1856   1960 R
ThO248 21023   20983   20677   21032   20823   21054  
UO254 5240   5231   5108   5256   5199   5265  
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 0.4 0.2 1.6 0.5 0.3 1.5 1.4 0.8
slope 2.7 -0.0 -0.0 -0.2 -0.1 -0.1 0.3 0.0 0.0
interc 2.0E+4 1.7E+0 1.1E+0 2.0E+3 5.3E+2 1.0E+3 1.7E+3 2.1E+4 5.2E+3
cps 1.0E+4 1.1E-1 4.7E-2 1.9E+2 1.6E+1 9.7E+1 3.6E+2 4.2E+3 2.6E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000345 0.082944 0.517395 28.493778 0.515085 11.504964 7.163962
ratio 0.000272 0.001865 0.009229 0.350572 0.008645 0.139621 0.092981

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01004(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1959 0.0061 1153.0195 32.6  
Pb207/Pb206 0.0829 0.0019 1267.8980 43.3  
Pb207/U235 2.2399 0.0906 1193.6165 28.0  
Pb208/Th232 0.0566 0.0023 1112.7744 43.1  
204 corrected          
Pb206/U238 0.1948 0.0061 1147.1951 32.7  
Pb207/Pb206 0.0781 0.0046 1148.6787 113.1  
Pb207/U235 2.0966 0.1472 1147.7085 47.1  
Pb208/Pb206 0.5079 0.0137      
Pb208/Th232 0.0553 0.0025 1087.0434 47.4  
207 corrected          
Pb206/U238 0.1948 0.0060 1147.1258 32.5  
Pb208/Pb206 0.5078 0.0105      
Pb208/Th232 0.0552 0.0023 1086.7372 43.6  
208 corrected          
Pb206/U238 0.1981 0.0063 1165.0220 33.9  
Pb207/Pb206 0.0928 0.0078 1484.4594 150.7  
Pb207/U235 2.5354 0.2362 1282.2564 65.7  

CONCENTRATIONS
CONCENTRATIONS U:42.0 ppm Th:75.3 ppm Th/U:1.790 ±0.0 Pb204:2.4 ppb sens 17.0