CAPINTEC, INC CRC
®
-25R
CAPINTEC RADIOISOTOPE DOSE CALIBRATOR
CHAMBER SENSITIVITY
88
Co 60
Na 22
Co 60
Bi 207
88
Cs 134
Cs 137
Cs 134
Bi 207
Na 22
Sn 113 : In 113m
Cr 51
Hg 203
Am 241
Bi 207
Hg 203
Xe 133
Co 57
Tc 99m
Ce 139
Sn 113
I 125
Ce 139
Xe 133
Am 241, Co 57
500
1000
1500
0.1
0.2
0.3
0.4
0.5
0.6
PHOTON ENERGY
keV
Co60 = 1.00
Figure A1-1
CALIBRATION SETTING NUMBERS
The Calibration Setting Numbers in Table I are applicable to the Capintec Radioisotope
Calibrator only.
The CRC
®
-25R is a direct reading instrument. No manual multiplication or division should be
performed, even if the Calibration Setting Number is followed by a multiplication sign "×" or a
division sign “÷” and a number.
If the sample contains radioactive impurities, the meter indication will always be higher than
the actual activity of the principal isotope. It will not, however, be the total activity of the
principal isotope and the impurities.
If a Radium Needle is measured, the reading will be lower than the true activity in the needle
due to the shielding effects (filtration) of the needle. To estimate the true activity in a needle,
increase the reading obtained with a calibration number for Ra226 (778) by 2% for each
0.1mm of platinum wall thickness. For example, add 10% to the reading for a 0.5mm wall
platinum needle and add 20% to the reading for a 1.0mm wall platinum needle to estimate
the true Radium activity.
A2 - 4 APPENDIX II June 09
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