SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-22.1, 2014-08-15, 02:35:27, 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=1383, z=3426
primary beam = -1.9nA
QT1 Y defl = -1745 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 195.82522 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98322 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02822 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98818 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99318 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99618 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07493 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05064 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05730 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18657   20033   20194   20534   20777   21196  
Pb204 0   3   0   1   5   1  
Bkgrnd 0   1   0   2   0   2  
Pb206 1736   1687   1646   1598   1725   1566  
Pb207 453   406   417   401   386   426  
Pb208 834   769   757   752   723   734  
U238 1563   1617   1604   1637   1675   1675  
ThO248 15903   15759   15523   15518   15525   15362  
UO254 4641   4494   4584   4448   4518   4462  
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 0.3 1.4 0.2 2.2 1.2 0.6 0.2 0.4 0.8
slope 1.9 0.0 0.0 -0.1 -0.0 -0.1 0.1 -0.6 -0.2
interc 2.0E+4 7.4E-1 1.1E-1 1.7E+3 4.3E+2 8.2E+2 1.6E+3 1.6E+4 4.6E+3
cps 1.0E+4 1.7E-1 8.7E-2 1.7E+2 1.4E+1 7.7E+1 3.2E+2 3.1E+3 2.3E+3
rej1 18657                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000530 0.083021 0.461946 31.642591 0.512509 9.667027 7.012373
ratio 0.000467 0.002221 0.009702 0.332984 0.009226 0.102847 0.082781

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01042(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2034 0.0060 1193.5222 32.3  
Pb207/Pb206 0.0830 0.0022 1269.7070 51.3  
Pb207/U235 2.3282 0.0987 1220.9361 29.7  
Pb208/Th232 0.0614 0.0024 1204.8176 46.4  
204 corrected          
Pb206/U238 0.2017 0.0062 1184.2717 33.1  
Pb207/Pb206 0.0755 0.0076 1081.8815 189.0  
Pb207/U235 2.0994 0.2277 1148.6055 72.0  
Pb208/Pb206 0.4468 0.0197      
Pb208/Th232 0.0589 0.0033 1156.8902 62.9  
207 corrected          
Pb206/U238 0.2026 0.0060 1189.1560 32.3  
Pb208/Pb206 0.4548 0.0113      
Pb208/Th232 0.0602 0.0025 1182.2014 48.1  
208 corrected          
Pb206/U238 0.2029 0.0062 1190.7778 33.0  
Pb207/Pb206 0.0808 0.0070 1216.6395 161.1  
Pb207/U235 2.2603 0.2150 1199.9990 64.8  

CONCENTRATIONS
CONCENTRATIONS U:37.3 ppm Th:57.1 ppm Th/U:1.530 ±0.0 Pb204:3.5 ppb sens 16.4