Capintec CRC-25R - Page 206

CAPINTEC, INC CRC
®
-25R
Uncertainty Due to
Radioisotopes
Calibration
Setting
Number
Syringe
Corr. %
Published
Data %
Half-Life
(NCRP-58)
Ref. Comments
142
Pr Praseodymium
226 × 10
14 19.13 H 4 ORNL76
144
Pr Praseodymium
137 × 10
5 17.28 M 5 ORNL76
Estimation use only. β
dominant.
144
Ce
144
Pr
Cerium
Eqb.
Praseodymium
387 × 10
5 2.8 285.0 D 1 NBS73
Ref: 36.7 & 133.5 keV.
Reading gives sum of
144
Ce &
144
Pr Act. in
equilibrium sample.
Eqb. after 2 hours.
145
Pm Promethium 207 10 3 17.7 Y 4 ORNL76
147
Nd Neodymium 213 5 4 10.98 D 1 ORNL76
157
Dy Dysprosium 424 5 8.1 H 1 NM75
169
Yb Ytterbium 948 3 2.5 32.03 D 1 NBS78
171
Tm Thulium
292 × 100
4 1.92 Y 1 NM75
175
Yb Ytterbium
308 × 10
2 13 4.19 D 1 ORNL76
177
Lu Lutetium
450 × 10
2 7 6.71 D 1 ORNL76
181
Hf Hafnium 387 6 42.4 D 1 ORNL76
181
W Tungsten 165 3 11 121.2 D 3 ORNL76
188
W Tungsten
111 × 100
69.4 D 5 NM75 Decays to
188
Re. Eqb.
after 7 days. See App.
IV
188
Re Rhenium
496 × 10
16.98 H 2 NM75
188
W Tungsten
(Eqb.
188
Re)
522 × 10
Reading gives
188
W
Act. in eqb. sample.
Eqb. after 5 days.
188
Re Rhenium
(Eqb.
188
W)
516 × 10
Reading gives
188
Re
Act. in eqb. sample.
188
W
188
Re
Tungsten
Eqb.
Rhenium
217 × 10
Reading gives sum of
188
W &
188
Re activity in
equilibrium sample.
190m
Os Osmium 858 9.90 M NM75
191
Os Osmium 250 2 13 15.4 D 2 ORNL76
192
Ir Iridium 408 73.83 D 1 NDS73
194
Ir Iridium
469 × 10
18 19.15 H 3 ORNL76
197
Pt Platinum
686 × 10
2 6 18.3 H 3 ORNL76
197
Hg Mercury 197 2 2.9 64.1 H 1 NBS76 Ref. for 70 & 77 keV.
198
Au Gold 149 1.65 2.696 D 2 NBS78
199
Au Gold 053 6 3.139 D 7 ORNL76
201
Tl Thallium 205 2 2.0 72.91 H 2 NBS76
203
Hg Mercury 093 1.1 46.60 D 1 NBS73
203
Pb Lead 344 2 51.88 H 1 ORNL76
A2 - 14 APPENDIX II June 09