SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-1.1, 2014-08-14, 10:20:23, 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=7979, y=1786, z=2237
primary beam = -1.8nA
QT1 Y defl = -1718 bits; QT1 Z defl = 350 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 |
195.81828 |
0.00000 |
2.0 |
8.0 |
12 |
YES 3.0 |
REF |
ALW |
COUNTER |
R 1.0E-12 |
| 2 |
Pb204 |
203.97628 |
0.00000 |
10.0 |
3.0 |
11 |
NO 10.0 |
NONE |
ALW |
COUNTER |
|
| 3 |
Bkgrnd |
204.02128 |
0.00000 |
10.0 |
5.0 |
11 |
NO 0.5 |
BAC |
ALW |
COUNTER |
|
| 4 |
Pb206 |
205.98182 |
0.00000 |
10.0 |
4.0 |
11 |
YES 6.0 |
REF |
ALW |
COUNTER |
R 1.0E-12 |
| 5 |
Pb207 |
206.98682 |
0.00000 |
30.0 |
2.0 |
11 |
NO 5.0 |
NONE |
ALW |
COUNTER |
FS+10mV=1Mcps=FIXED As |
| 6 |
Pb208 |
207.98982 |
0.00000 |
10.0 |
2.0 |
11 |
NO 4.0 |
NONE |
ALW |
COUNTER |
|
| 7 |
U238 |
238.06780 |
0.00000 |
5.0 |
3.0 |
10 |
YES 3.0 |
REF |
ALW |
COUNTER |
|
| 8 |
ThO248 |
248.04414 |
0.00000 |
5.0 |
3.0 |
9 |
YES 3.0 |
NONE |
ALW |
COUNTER |
|
| 9 |
UO254 |
254.04964 |
0.00000 |
2.0 |
3.0 |
9 |
YES 2.0 |
REF |
ALW |
COUNTER |
|
AMU-B calibration field offset -0.076 G.
DATA
| Zr2O |
20366 |
|
20823 |
|
21382 |
|
21871 |
|
21927 |
|
22432 |
|
| Pb204 |
2 |
|
1 |
|
2 |
|
2 |
|
3 |
|
2 |
|
| Bkgrnd |
1 |
|
0 |
|
3 |
|
1 |
|
1 |
|
1 |
|
| Pb206 |
19259 |
|
18911 |
|
18988 |
|
18407 |
|
18333 |
|
18261 |
|
| Pb207 |
3458 |
|
3417 |
|
3472 |
|
3329 |
|
3367 |
|
3307 |
|
| Pb208 |
1288 |
|
1326 |
|
1276 |
|
1268 |
|
1246 |
|
1260 |
|
| U238 |
40074 |
|
41284 |
|
41115 |
|
41930 |
|
42344 |
|
43086 |
R |
| ThO248 |
58821 |
|
57791 |
|
58319 |
|
58223 |
|
58512 |
|
58924 |
|
| UO254 |
115669 |
|
115376 |
|
115454 |
|
115231 |
|
115632 |
|
115785 |
R |
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 |
0.2 |
0.3 |
1.2 |
0.5 |
0.3 |
2.1 |
3.3 |
0.4 |
| slope |
2.6 |
0.0 |
0.0 |
-1.4 |
-0.2 |
-0.1 |
3.5 |
0.5 |
0.2 |
| interc |
2.0E+4 |
1.5E+0 |
1.1E+0 |
1.9E+4 |
3.5E+3 |
1.3E+3 |
4.0E+4 |
5.8E+4 |
1.2E+5 |
| cps |
1.1E+4 |
2.0E-1 |
1.2E-1 |
1.9E+3 |
1.1E+2 |
1.3E+2 |
8.3E+3 |
1.2E+4 |
5.8E+4 |
| rej1 |
|
|
|
|
|
|
|
|
|
| rej2 |
|
|
|
|
|
|
|
|
|
RATIOS
| |
204/206 |
207/206 |
208/206 |
196/238 |
206/238 |
248/238 |
254/238 |
| error +- |
0.000047 |
0.060499 |
0.068448 |
1.303424 |
0.225745 |
1.410203 |
6.973674 |
| ratio |
0.000041 |
0.000469 |
0.000815 |
0.005232 |
0.000985 |
0.005930 |
0.021720 |
CALIBRATION
CALIBRATION
Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00464(UO/U)^2)
REDUCED DATA
| |
rad cor |
+- |
age Ma |
+- |
|
| uncorrected |
|
|
|
|
|
| Pb206/U238 |
0.0906 |
0.0007 |
559.0000 |
4.1 |
|
| Pb207/Pb206 |
0.0605 |
0.0005 |
621.4524 |
16.6 |
|
| Pb207/U235 |
0.7556 |
0.0087 |
571.4823 |
5.0 |
|
| Pb208/Th232 |
0.0277 |
0.0004 |
551.5851 |
8.2 |
|
| 204 corrected |
|
|
|
|
|
| Pb206/U238 |
0.0905 |
0.0007 |
558.6014 |
4.1 |
|
| Pb207/Pb206 |
0.0598 |
0.0008 |
597.3300 |
28.0 |
|
| Pb207/U235 |
0.7467 |
0.0119 |
566.2977 |
6.9 |
|
| Pb208/Pb206 |
0.0668 |
0.0017 |
|
|
|
| Pb208/Th232 |
0.0270 |
0.0007 |
538.3949 |
14.1 |
|
| 207 corrected |
|
|
|
|
|
| Pb206/U238 |
0.0904 |
0.0007 |
557.9752 |
4.1 |
|
| Pb208/Pb206 |
0.0643 |
0.0014 |
|
|
|
| Pb208/Th232 |
0.0259 |
0.0006 |
517.6545 |
12.2 |
|
| 208 corrected |
|
|
|
|
|
| Pb206/U238 |
0.0906 |
0.0007 |
559.2314 |
4.1 |
|
| Pb207/Pb206 |
0.0609 |
0.0006 |
635.2730 |
21.6 |
|
| Pb207/U235 |
0.7608 |
0.0102 |
574.4799 |
5.9 |
|
CONCENTRATIONS
CONCENTRATIONS
U:903.0 ppm Th:202.4 ppm Th/U:0.224 ±0.0 Pb204:3.3 ppb sens 17.5
