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Activity standards in the form of solutions

Solutions of individual nuclides

Activity standards in the form of solutions are delivered in sealed Jena glass ampoules. They are 15.2 mm in diameter, about 60 mm in height, and their wall thickness is 0.5 mm. They normally contain 2 mL of the respective solution.

The chemical composition of the solution is selected such that its stability is guaranteed at a minimum concentration of solid matter and acid. When dilutions are prepared, in particular in glass jars, the concentration of the inactive carrier stated in the calibration certificate should at least be maintained to avoid wall adsorption of the radionuclide.

On request, solutions of lower specific activity can be prepared by dilution of the solutions available. The customer will be charged with the production costs of the solution.

At irregular intervals, activity standards of other nuclides than those stated in the Table "Activity standards in the form of solutions" can be delivered in the form of solutions (cf. above: Activity standards).

The calibration certificate is accompanied by a data sheet stating the values of the radionuclide constants (photon energies and photon emission probabilities per decay and, where appropriate, maximum and mean beta-particle energies) recommended by the PTB.

Figure 1: Ampoule dimensions (in millimetres)

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Table 2: Activity standards in the form of solutions

Nuclide Half-
life
Chemical compo-
sition of the
solution
Specific
Activity
in kBq/g
Uncer-
tainty
in % (3)
Availa-
bility
H-3 12.33 a H2O 5
50;500
5000;50000
1.7
1.4
1.4
ex stock
Be-7 53.23 d BeCl2
HCL 0.1 mol/L
200;2000 1.4
(2)
C-14 5730 a Na2CO3
NAOH 0.001 mol/L
10;100
1000;10000
3.3
3.3
ex stock
Na-22 950.5 d NaCl
HCL 0.1 mol/L
10
100;1000
1
0.7
ex stock
Cr-51 27.71 d CrCl3
HCL 0.1 mol/L
20
200;2000
1.4
1
(1)
Mn-54 312.15 d MnCl2
HCL 0.1 mol/L
10
100;1000
1
0.7
ex stock
Fe-55 1005 d FeCl3
HCL 0.1 mol/L
200;2000 2.5 ex stock
Co-57 271.83 d CoCl2
HCL 0.1 mol/L
20
200:2000
1.4
1
ex stock
Co-60 1925.3 d CoCl2
HCL 0.1 mol/L
4:40
400:4000
1
0.7
ex stock
Zn-65 243.94 d ZnCl2
HCL 0.1 mol/L
20
200;2000
1.4
1.4
ex stock
Sr-85 64.85 d SrCl2
HCL 0.1 mol/L
20
200;2000
1.4
1
(2)
Y-88 106.63 d YCl3
HCL 0.1 mol/L
10
100;1000
1.4
1
(2)
Sr-89 50.53 d SrCl2
HCL 0.1 mol/L
2;20
200;2000
2
1.7
(1)
Sr-90 28.81 a SrCl2 + YCl3
HCL 0.1 mol/L
0.4;4
40;400;4000
1.7
1.5
ex stock
Cd-109 462.1 d CdCl2
HCL 0.1 mol/L
10;100
1000
1.7
1.7
ex stock
Sb-125 1007.7 d SbCl3 und Weinsäure
HCL 2 mol/L
10
100;1000
1.7
1.4
ex stock
I-125 59.39 d NaI und Na2S2O3 mit
0.1 % Formalin
10
100;1000
1.7
1.4
(1)
I-129 1.57*107 a NaI und Na2S2O3 mit
0.1 % Formalin
1 3.3
ex stock
I-131 8.021 d NaI und Na2S2O3 mit
0.1 % Formalin
4
1000
1
1.7
March/
April
Ba-133 10.54 a BaCl2
HCL 0.1 mol/L
0.4;4
40;400;1000
1.4
1
ex stock
Cs-134 754.0 d CsCl
HCL 0.1 mol/L
10
100;1000
1
0.7
ex stock
Cs-137 30.13 a CsCl
HCL 0.1 mol/L
0.4;4
40;400;4000
1.4
1
ex stock
Ce-139 137.66 d CeCl3
HCL 1 mol/L
10;100
1000
1
1
(2)
Ce-144 284.7 d CeCl3
HCL 1 mol/L
10;100
1000
1.4
1.4
ex stock
Pm-147 958.20 d NdCl3
HCL 0.5 mol/L
40;400
4000
2
2
ex stock
Eu-152 13.53 a EuCl3
HCL 0.1 mol/L
4
40;400;4000
2
1.4
ex stock
Tl-204 1381 a Tl2SO4
HNO3 0.1 mol/L
6
60;600
1.7
1.4
ex stock
Bi-207 31.55 a BiCl3
HCL 1 mol/L
15 1.5
ex stock
Pb-210 22.3 a Pb(NO3)2 + Bi(NO3)3
HNO3 1.2 mol/L
1.5
15;150;1500
2
1.5
ex stock
Ra-226 1600 a BaCl2
HCL
0.1;1 1.4
ex stock
Am-241 432,2 a La(NO3)3
HNO3 0.1 mol/L
1;4
10;400;4000
1.4
1
ex stock
(1) The solutions are prepared and delivered yearly. The dates of delivery will be announced in good time. Please let us know about which deliveries you wish to be informed.
(2) Raw solutions of this radionuclide are offered only rarely by the producers. The dates of delivery for activity standards are, therefore, undefined.
(3) The uncertainty stated is the relative expanded uncertainty of measurement in percent obtained by multiplying the standard uncertainty by a coverage factor k = 2.

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