Overview Point Sources

The products shown on these pages are representative sources used for common applications.

If you cannot find the product with your specifications, please contact us using the corresponding email contact on this website. In most cases we will be able provide you with a solution meeting your requirements.

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Rectangular Type Sources

Construction

The radioactive isotope is absorbed in an ion-exchange bead approximately 1mm in diameter. The bead is fixed inside a solid plastic capsule. The active bead is visible, and located at the geometric centre of the source. The engraving is color-coded.

ISO classification

ISO/12/C34343

Drawing: VZ-1240-001

Tolerance

The maximum deviation of the delivered activity from the nominal values is -10% to +30% for all radionuclides with the exception of Hg-203 which is -10% to +50%.

Absorption corrections

The effect of absorption and scattering in the source depends on the measurement geometry and the measurement equipment. The table below shows the transmission factor for the main gamma rays emitted. Transmission factors at other energies may be calculated by interpolation. The transmission factor is the fraction of gamma rays produced in the source that will emerge from its surface calculated for narrow beam emission normal to the plane of the source.

Energy [keV] Radionuclide Transmission factor
60 Am-241 0.970
88 Cd-109 0.981
122 Co-57 0.982
279 Hg-203 0.986
344 Eu-152 0.987
662 Cs-137 0.990
834 Mn-54 0.991
1173 Co-60 0.993
1836 Y-88 0.994

 

Ordering Information – Single radionuclides

Radionuclide Activity [kBq] Overall uncertainty [%] Product code (DAkkS certificate)
Am-241 37 3 AMR1122
370 3 AMR1152
Ba-133 37 3 BDR1122
370 3 BDR1152
Cd-109 37 4 CUR1122
370 4 CUR1152
Cs-137 37 3 CDR1122
370 3 CDR1152
Co-57 37 3 CTR1122
370 3 CTR1152
Co-60 37 3 CKR1122
370 3 CKR1152
Eu-152 37 3 EFR1122
370 3 EFR1152
Hg-203 74 4 MBR1222
740 4 MBR1252
Mn-54 37 3 MFR1122
370 3 MFR1152
Na-22 37 3 SKR1122
370 3 SKR1152
Y-88 37 3 YER1122
370 3 YER1152

 

Radionuclide sets

Each set of sources is supplied in a presentation box which also contains a pair of forceps, two positron absorbers, and an adaptor plate. For easy reference, a copy of the calibration information is shown in the lid of the box.

Ordering Information – Radionuclide Sets

Radionuclide Activity [kBq] Product code (DAkkS certificate)
Set 1 containing: QCR3110 (total activity: 370 kBq)
Am-241 37
Ba-133 37
Cs-137 37
Co-57 37
Co-60 37
Hg-203 74
Mn-54 37
Na-22 37
Y-88 37
Set 2 containing: QCR310 (total activity: 3.7 MBq)
Am-241 370
Ba-133 370
Cs-137 370
Co-57 370
Co-60 370
Hg-203 740
Mn-54 370
Na-22 370
Y-88 370

Gamma Standards – Type C

The type C configuration can be used to check the performance of G.M. and NaI (Tl) detectors. The maximim activity of this source type is 370 kBq. Please enquire.

Overall Dimensions
Height Width Length Active Diameter
0.075” 0.43” 0.925” 0.118”
1.91 mm 11 mm 23.5 mm 3 mm

 

Window & Active Deposit
Window Nature of Active Deposit
Plastic Evaporated Metallic Salts

 

Disk Type Sources

Construction

With the exception of Ra-226, Am-241 and Pb-210sources,the radioactive isotope is absorbed in an ion-exchange bead approximately 1mm in diameter. The bead is fixed inside a solid plastic capsule 25mm in diameter and 3mm thick. The active bead is visible, and located at the geometric centre of the source.

For Am-241 and Pb-210, the active component is in the form of a ceramic bead. For Ra-226, a foil is sealed and fixed inside a 6 mm thick plastic disc. This construction reduces the possibility of release of radon gas from the decay of Ra-226.

Tolerances

The maximum deviation of the delivered activity from the nominal values is -10% to +30% for all radionuclides with the exception of Hg-203 (which is -10% to +50%) and Ra-226 (which is ±30%).

ISO classification

ISO/12/C34313

Drawing: VZ-477-001

Drawing: VZ-478-001 (Pb-210, Am-241)

Drawing: VZ-3293-001 (Ra-226)

Absorption corrections

The effect of absorption and scattering in the source depends on the measurement geometry and the measurement equipment. The table shows the transmission factor for the main gamma rays emitted. Transmission factors at other energies may be calculated by interpolation. The transmission factor is the fraction of gamma-rays produced in the source that will emerge from its surface calculated for narrow beam emission normal to the plane of the source.

Energy [keV] Radionuclide Transmission factor
47 Pb-210 0.964
60 Am-241 0.958
88 Cd-109 0.970
122 Co-57 0.973
279 Hg-203 0.979
344 Eu-152 0.979
356 Ba-133 0.984
662 Cs-137 0.985
834 Mn-54 0.987
1173 Co-60 0.988
1274 Na-22 0.991
1836 Y-88  0.991

 

Ordering Information – Single radionuclides

Radionuclide Nominal activity [kBq] Overall uncertainty [%] Product code (DAkks certificate)
Am-241 37 3 AMR8122
370 3 AMR8152
Ba-133 37 3 BDR8122
370 3 BDR8152
3700 3 BDR8252
Cd-109 370 4 CUR8152
Cs-137 37 3 CDR8122
370 3 CDR8152
3700 3 CDR8252
Co-57 37 3 CTR8122
370 3 CTR8152
3700 3 CTR8252
Co-60 37 3 CKR8122
370 3 CKR8152
3700 3 CKR8252
Eu-152 37 3 EFR8122
370 3 EFR8152
Hg-203 74 4 MBR8222
740 4 MBR8252
Mn-54 37 3 MFR8122
370 3 MFR8152
Na-22 37 3 SKR8122
370 3 SKR8152
Pb-210 200 4 RBR8122
Y-88 37 3 YER8122
370 3 YER8152

 

Radionuclide set

The set contains 8 sources of long-lived radionuclides for calibrating gamma ray spectrometers from 46keV to 1836keV.

The set of sources is supplied in a presentation box and includes a positron absorber. For easy reference, a copy of the calibration information is shown in the lid of the box.

Ordering information – Radionuclide set

Radionuclide Activity [kBq] Product code (DAkkS certificate)
Set comprising: QCRB9481 (total activity: 452 kBq)
Am-241 37
Ba-133 37
Cs-137 37
Co-60 37
Eu-152 37
Na-22 37
Pb-210 200
Ra-226 30

 

Gamma Standards - Type D

The type D configuration is mainly used for checking the performance of G.M. and NaI(Tl) detectors. The type D disk is a 1” (25.4 mm) diameter by 0.250” (6.35 mm) thick disk constructed of high strength plastic. The active diameter is 0.197” (5 mm).

Overall Diameter Active Diameter Height
1”
0.197” 0.25”
25.4 mm 5 mm 6.35 mm

 

Window & Active Deposit
Window Nature of Active Deposit
Plastic Evaporated Metallic Salts

 

Nuclide Model no. Activity range Remark
Ag-110m GF-110-D 3,7 kBq – 3,7 MBq On Request
Am-241 GF-241-D 3,7 kBq – 3,7 MBq
Ba-133 GF-133-D  3,7 kBq – 3,7 MBq
Be-7 GF-007-D  3,7 kBq – 3,7 MBq
Bi-207 GF-207-D  3,7 kBq – 3,7 MBq
Cd-109 GF-109-D  3,7 kBq – 18,5 MBq
Ce-139 GF-139-D  3,7 kBq – 3,7 MBq
Ce-141 GF-141-D  3,7 kBq – 3,7 MBq On Request
Co-56 GF-056-D  3,7 kBq – 3,7 MBq On Request
Co-57 GF-057-D  3,7 kBq – 37 MBq
Co-58 GF-058-D  3,7 kBq – 3,7 MBq On Request
Co-60 GF-060-D 3,7 kBq – 18,5 MBq
Cr-51 GF-051-D  3,7 kBq – 3,7 MBq
Cs-134 GF-134-D  3,7 kBq – 3,7 MBq
Cs-137 GF-137-D  3,7 kBq – 37 MBq
Eu-152 GF-152-D  3,7 kBq – 3,7 MBq
Eu-154 GF-154-D  3,7 kBq – 3,7 MBq
Eu-155 GF-155-D  3,7 kBq – 3,7 MBq
Fe-59 GF-059-D  3,7 kBq – 3,7 MBq On Request
Gd-153 GF-153-D  3,7 kBq – 18,5 MBq
Ge-68 GF-068-D  3,7 kBq -20 MBq
Ho-166m GF-166-D  3,7 kBq – 370 kBq
I-125 GF-125-D  3,7 kBq – 3,7 MBq special nuclide, Please check availability.
I-129 GF-129-D  3,7 kBq – 3,7 MBq
I-131 – Mock GF-131SIM-D  37 kBq – 370 kBq Contains mixture of Ba-133/ Cs-137 (simulates I-131)
Hg-203 GF-203-D  370 kBq – 3,7 MBq
Mn-54 GF-054-D  3,7 kBq – 3,7 MBq
Na-22 GF-022-D  3,7 kBq – 3,7 MBq
Ra-226 GF-226-D  3,7 kBq – 370 kBq
Sb-124 GF-124-D  3,7 kBq – 3,7 MBq On Request
Sb-125 GF-125A-D  3,7 kBq – 3,7 MBq
Sc-46 GF-046-D  3,7 kBq – 3,7 MBq On Request
Se-75 GF-075-D  3,7 kBq – 3,7 MBq
Sn-113 GF-113-D  3,7 kBq – 3,7 MBq
Sr-85 GF-085-D  3,7 kBq – 3,7 MBq
Th-228 GF-228-D  3,7 kBq – 370 kBq
U-235 GF-235-D 3,7 kBq
U-238 (Natural) GF-238U-D  3,7 kBq On Request
Y-88 GF-088-D  3,7 kBq – 3,7 MBq
Zn-65 GF-065-D  3,7 kBq – 3,7 MBq
Zr-95/Nb-95 GF-095-D  3,7 kBq – 3,7 MBq On Request

 

Ordering Information – Source sets

Each set contains:

Ba-133, Cd-109, Co-57, Co-60, Cs-137, Mn-54 and Na-22

Model No. Total activity Product code Remarks
GF-290-0.1D 25,9 kBq GF-290-0,1D 7 sources each 3.7kBq
GF-290-1D 259 kBq GF-290-1D 7 sources each 37kBq
GF-290-10D 25,9 MBq GF-290-10D 7 sources each 370kBq

 

Gamma Standards - Type M

The type M thin “scatterless” disk is used in applications involving high resolution solid state detectors. The activity is deposited on 9 mg/cm2 aluminumized Mylar (polyester) disk, and covered with 0.9 mg/cm2 Kapton (polymide). The source is supplied in a removable aluminum holder. In the holder the source has an overall diameter of 1” (25.4 mm) and a thickness of 0.125” (3.18 mm). Out of the holder the source is 0.937” (23.8 mm) in diameter with a thickness of approximately 0.030” (0.76 mm). The active diameter is 0.12” (3 mm).

Overall Diameter Active Diameter Height
1” 0.12” 0.125”
25.4 mm 3 mm 3.18 mm

 

Window Nature of Active Deposit
0.010” (254 µm) Aluminized Mylar Evaporated Metallic Salts

 

Exceptions
Fe-55: 0.00025″ (0.0064 mm) Aluminized Mylar
Am-241: 0.001” (0.0254 mm) Aluminum and Platinum Foils

 

Nuclide Product code Activity range Remarks
Ag-110m GF-110-M 3,7 kBq – 3,7 MBq On Request
Am-241 GF-241-M 3,7 kBq – 370 kBq
Ba-133 GF-133-M 3,7 kBq – 3,7 MBq
Be-7 GF-007-M 3,7 kBq – 3,7 MBq
Bi-207 GF-207-M 3,7 kBq – 3,7 MBq
Cd-109 GF-109-M 3,7 kBq – 3,7 MBq
Ce-139 GF-139-M 3,7 kBq – 3,7 MBq
Ce-141 GF-141-M 3,7 kBq – 3,7 MBq On Request
Co-56 GF-056-M 3,7 kBq – 3,7 MBq On Request
Co-57 GF-057-M 3,7 kBq – 3,7 MBq
Co-58 GF-058-M 3,7 kBq – 3,7 MBq On Request
Co-60 GF-060-M 3,7 kBq – 3,7 MBq
Cr-51 GF-051-M 3,7 kBq – 3,7 MBq On Request
Cs-134 GF-134-M 3,7 kBq – 3,7 MBq On Request
Cs-137 GF-137-M 3,7 kBq – 3,7 MBq
Eu-152 GF-152-M 3,7 kBq – 3,7 MBq
Eu-154 GF-154-M 3,7 kBq – 3,7 MBq
Eu-155 GF-155-M 3,7 kBq – 3,7 MBq
Fe-55 GF-055-M 3,7 kBq – 3,7 MBq
Fe-59 GF-059-M 3,7 kBq – 3,7 MBq On Request
Gd-153 GF-153-M 3,7 kBq – 3,7 MBq
Ge-68 GF-068-M 3,7 kBq – 3,7 MBq
Ho-166m GF-166-M 3,7 kBq – 37 kBq
I-131 – Mock GF-131SIM-M 37 kBq – 370 kBq Contains mixture of Ba-133/ Cs-137 (simulates I-131)
Hg-203 GF-203-M 370 kBq – 3,7 MBq
Mn-54 GF-054-M 3,7 kBq – 3,7 MBq
Na-22 GF-022-M 3,7 kBq – 3,7 MBq
Sb-124 GF-124-M 3,7 kBq – 3,7 MBq On Request
Sb-125 GF-125A-M 3,7 kBq – 3,7 MBq
Sc-46 GF-046-M 3,7 kBq – 3,7 MBq On Request
Se-75 GF-075-M 3,7 kBq – 3,7 MBq
Sn-113 GF-113-M 3,7 kBq – 3,7 MBq
Sr-85 GF-085-M 3,7 kBq – 3,7 MBq
Y-88 GF-088-M 3,7 kBq – 3,7 MBq
Zn-65 GF-065-M 3,7 kBq – 3,7 MBq
Zr-95/Nb-95 GF-095-M 3,7 kBq – 3,7 MBq On Request

 

Ordering Information – Source sets

Each set consists of:

Ba-133, Cd-109, Co-57, Co-60, Cs-137, Mn-54 and Na-22

Model no. Total activity Product code Remarks
GF-290-0.1M 25,9 kBq GF-290-0,1M 7 sources each 3.7kBq
GF-290-1M 259 kBq GF-290-1M 7 sources each 37kBq
GF-290-10M 2,59 MBq GF-290-10M 7 sources each 370kBq

 

Mixed radionuclide calibration sources for 60-1836 keV and 46-136 keV ranges

Application

The QCD1 source can be used for calibrating high resolution gamma-ray spectrometers where a solid source with minimal self-absorption is required. The energy range covered is 88-1836keV.

Certification

The source is supplied with a UKAS certificate of calibration.

Construction

The source is prepared by dispensing an accurately weighed aliquot of mixed radionuclide solution onto a polyester tape 0.06mm thick. The aliquot is dried in an atmosphere of hydrogen sulphide to prevent volatilization of mercury, and then covered with a second layer of tape. The active deposit is approximately 5 mm in diameter. The tape is attached to a 1mm thick aluminium annulus of inner diameter 38mm and outer diameter 54mm. The source is constructed of thin polyester tape to minimize self-absorption of the gamma-rays. The source should be handled carefully by its aluminium ring using rubber-tipped forceps.

Ordering Information

Radionuclides Activity [kBq] Gamma-ray energy [keV] Overall uncertainty [%] Product code (DAkkS certificate)
Radionuclide mixture NG3 containing: QCRB1186 (total activity: 40 kBq)
Am-241 3 60 3
Cd-109 15.6 88 4
Co-57 0.6 122 2.5
Ce-139 0.7 166 2.5
Hg-203 2.1 279 2.5
Sn-113 2.8 392 5
Sr-85 3.8 514 2.5
Cs-137 2.6 662 2.5
Co-60 3.0 1173 1
1333 1
Y-88 5.9 898 4
1836 4
Radionuclide mixture NG4 containing: QCRB4136 (total activity: 46 kBq)
Pb-210 20 47 5
Am-241 4 60 3
Cd-109 20 88 4
Co-57 2 122 2.5
Radionuclide mixture NG2 containing: QCRB13892 (total activity: 37 kBq)
Cd-109 15.6 88 4
Co-57 0.6 122 2.5
Ce-139 0.8 166 2.5
Hg-203 2.2 279 2.5
Sn-113 2.8 392 5
Sr-85 3.6 514 2.5
Cs-137 2.6 662 2.5
Co-60 3 1173 1
1333 1
Y-88 5.8 898 4
1836 4

 

Source for NaI spectrometers

Application

This source type is used for the energy calibration of NaI spectrometers, or as a check source for Ge-spectrometers.

Construction

The activity of each radionuclide is adsorbed in one ion exchange bead 1mm in diameter. The beads are mounted in a plastic disc 25mm in diameter and 3mm thick (drawing VZ-1285).

Ordering information

Radionuclide Nominal activity [kBq] Product code
Am-241 37 QCRB5936 (total activity: 148 kBq)
Co-57 37
Co-60 37
Cs-137 37
Na-22 3700