Capintec CRC-25R - Page 207

CAPINTEC, INC CRC
®
-25R
Uncertainty Due to
Radioisotopes
Calibration
Setting
Number
Syringe
Corr. %
Published
Data %
Half-Life
(NCRP-58)
Ref. Comments
204
Tl Thallium
420 × 100
2 2 3.78 Y 2 NDT70
207
Bi Bismuth 846 1.7 32.2 Y 9 NBS73 Ref. for 1064, 569.7,
76.7, & 1772 keV.
208
Tl Thallium
571 ÷ 2
3.053 M 4 NM75
212
Pb Lead 101 10.64 H 1 NM75 Decays to
212
Bi. Eqb.
after 1 hr. See App. IV.
212
Bi Bismuth
489 × 10
60.55 M 6 NM75
212
Pb Lead
(Eqb.
212
Bi)
158 Reading gives
212
Pb
Act. in eqb. sample.
Eqb. after 8 hours.
212
Bi Bismuth
(Eqb.
212
Pb)
135 Reading gives
212
Bi
Act. in eqb. sample.
212
Pb
212
Bi
Lead
Eqb.
Bismuth
030 or
146 × 2
Reading gives sum of
212Pb & 212Bi activity
in equilibrium sample.
224
Ra Radium
646 × 100
3.66 D 4 NM75
226
Ra Radium
+ chain of
daughters
778 0.5 1600 Y 7 NBS73 Reading in grams.
Commonly referred to
as "Radium "Source.
1.025 g/Ci of Ra-226.
239
Np Neptunium 147 6 2.355 D 4 ORNL76
241
Am Americium 055 4 1 432.2 Y 5 LMR69 Ref. for 59.5 & 14 keV.
June 09 APPENDIX II A2 - 15