SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-23.1, 2014-08-15, 02:55:37, 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=7991, y=1420, z=3477
primary beam = -1.9nA
QT1 Y defl = -1748 bits; QT1 Z defl = 400 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 |
195.82498 |
0.00000 |
2.0 |
8.0 |
12 |
YES 3.0 |
REF |
ALW |
COUNTER |
R 1.0E-12 |
2 |
Pb204 |
203.98298 |
0.00000 |
10.0 |
3.0 |
11 |
NO 10.0 |
NONE |
ALW |
COUNTER |
  |
3 |
Bkgrnd |
204.02798 |
0.00000 |
10.0 |
5.0 |
11 |
NO 0.5 |
BAC |
ALW |
COUNTER |
  |
4 |
Pb206 |
205.98859 |
0.00000 |
10.0 |
4.0 |
11 |
YES 6.0 |
REF |
ALW |
COUNTER |
R 1.0E-12 |
5 |
Pb207 |
206.99359 |
0.00000 |
30.0 |
2.0 |
11 |
NO 5.0 |
NONE |
ALW |
COUNTER |
FS+10mV=1Mcps=FIXED As |
6 |
Pb208 |
207.99659 |
0.00000 |
10.0 |
2.0 |
11 |
NO 4.0 |
NONE |
ALW |
COUNTER |
  |
7 |
U238 |
238.07455 |
0.00000 |
5.0 |
3.0 |
10 |
YES 3.0 |
REF |
ALW |
COUNTER |
  |
8 |
ThO248 |
248.05109 |
0.00000 |
5.0 |
3.0 |
9 |
YES 3.0 |
NONE |
ALW |
COUNTER |
  |
9 |
UO254 |
254.05710 |
0.00000 |
2.0 |
3.0 |
9 |
YES 2.0 |
REF |
ALW |
COUNTER |
  |
AMU-B calibration field offset -0.076 G.
DATA
Zr2O |
18120 |
  |
18195 |
  |
18988 |
  |
19240 |
  |
19932 |
  |
19944 |
  |
Pb204 |
5 |
  |
0 |
  |
0 |
  |
1 |
  |
4 |
  |
1 |
  |
Bkgrnd |
2 |
  |
0 |
  |
0 |
  |
2 |
  |
1 |
  |
1 |
  |
Pb206 |
1643 |
  |
1635 |
  |
1608 |
  |
1546 |
  |
1550 |
  |
1570 |
  |
Pb207 |
400 |
  |
395 |
  |
369 |
R |
366 |
  |
371 |
  |
354 |
  |
Pb208 |
773 |
  |
769 |
  |
719 |
  |
716 |
  |
710 |
  |
703 |
  |
U238 |
1518 |
  |
1653 |
  |
1637 |
R |
1726 |
  |
1674 |
  |
1731 |
  |
ThO248 |
16147 |
  |
16217 |
  |
16155 |
  |
16199 |
  |
16286 |
  |
16204 |
  |
UO254 |
4508 |
  |
4468 |
  |
4604 |
R |
4555 |
  |
4361 |
R |
4513 |
  |
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 |
2.3 |
0.9 |
0.2 |
0.4 |
0.2 |
0.3 |
1.4 |
0.1 |
1.8 |
slope |
2.7 |
-0.0 |
-0.0 |
-0.1 |
-0.1 |
-0.1 |
0.2 |
0.1 |
-0.1 |
interc |
1.8E+4 |
2.4E+0 |
1.0E+0 |
1.6E+3 |
4.0E+2 |
7.8E+2 |
1.5E+3 |
1.6E+4 |
4.5E+3 |
cps |
9.6E+3 |
1.8E-1 |
1.0E-1 |
1.6E+2 |
1.3E+1 |
7.4E+1 |
3.3E+2 |
3.2E+3 |
2.3E+3 |
rej1 |
  |
  |
  |
  |
  |
  |
  |
  |
  |
rej2 |
  |
  |
  |
  |
  |
  |
  |
  |
  |
RATIOS
  |
204/206 |
207/206 |
208/206 |
196/238 |
206/238 |
248/238 |
254/238 |
error +- |
0.000494 |
0.078399 |
0.462154 |
29.238829 |
0.484773 |
9.866064 |
6.865159 |
ratio |
0.000408 |
0.001842 |
0.008441 |
0.370334 |
0.007596 |
0.121209 |
0.099127 |
CALIBRATION
CALIBRATION
Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01029(UO/U)^2)
REDUCED DATA
  |
rad cor |
+- |
age Ma |
+- |
  |
uncorrected |
  |
  |
  |
  |
  |
Pb206/U238 |
0.2007 |
0.0066 |
1179.2136 |
35.3 |
  |
Pb207/Pb206 |
0.0784 |
0.0018 |
1157.0052 |
45.9 |
  |
Pb207/U235 |
2.1698 |
0.0927 |
1171.4060 |
29.3 |
  |
Pb208/Th232 |
0.0584 |
0.0025 |
1147.9515 |
46.9 |
  |
204 corrected |
  |
  |
  |
  |
  |
Pb206/U238 |
0.1991 |
0.0067 |
1170.6851 |
35.8 |
  |
Pb207/Pb206 |
0.0714 |
0.0066 |
967.6506 |
177.6 |
  |
Pb207/U235 |
1.9592 |
0.1997 |
1101.6246 |
66.3 |
  |
Pb208/Pb206 |
0.4481 |
0.0172 |
  |
  |
  |
Pb208/Th232 |
0.0562 |
0.0031 |
1105.3480 |
58.4 |
  |
207 corrected |
  |
  |
  |
  |
  |
Pb206/U238 |
0.2008 |
0.0066 |
1179.8765 |
35.4 |
  |
Pb208/Pb206 |
0.4632 |
0.0097 |
  |
  |
  |
Pb208/Th232 |
0.0586 |
0.0025 |
1151.2612 |
48.5 |
  |
208 corrected |
  |
  |
  |
  |
  |
Pb206/U238 |
0.2022 |
0.0068 |
1187.1720 |
36.3 |
  |
Pb207/Pb206 |
0.0849 |
0.0070 |
1312.7783 |
152.5 |
  |
Pb207/U235 |
2.3665 |
0.2202 |
1232.5375 |
64.3 |
  |
CONCENTRATIONS
CONCENTRATIONS
U:39.8 ppm Th:63.2 ppm Th/U:1.587 ±0.0 Pb204:3.4 ppb sens 15.0


