Sealed sources for calibrating surface contamination monitors. A wide range of products with different dimensions and radionuclides is available.

Sources designed for specific instruments and applications are available: calibration standards for Harwell Instrument monitors; photon emitting standards; tritium standards; standards for hand, foot, and whole body monitors.

Sources with dimensions and radionuclides other than those shown may also be available. Contact us for details.

These sources are available as well using the anodized manufacturing technique for sealed radiaoactive sources or the electroplated or evaporative deposition manufacturing technique.

Planchet sources available:

  • Alpha sources AF-Type
  • Beta sources BF Type
  • Beta sources SB Type
  • Alpha or Beta anodized type

Alpha Sources AF-Type

The majority of alpha standards listed are spectroscopy grade and are suitable for the most exacting research requirements as well as for routine counting room applications. Standards that emit radon gas, most notably Th-228 and Ra-226, should not be used in gross alpha applications. Most sources are prepared by electrodeposition of the desired nuclide on a mirror finish platinum surface foil and are fixed to the surface by diffusion-bonding. These sources exhibit narrow line widths, generally less than 20 keV FWHM for high specific activity nuclides such as Po-210 and Am-241. 

Beta sources BF Type

A wide range of beta emitting nuclides are offered for counting and educational uses. Certification of all BF Series sources includes both contained activity and 2p emission rate. Sources are traceable to NIST with ±2% to ±5% accuracy at the 99% confidence level. Source configurations are surface conductive on all surfaces to enable their use in windowless proportional counters.

Sr-90 sources produced by EZIP are certified as to the contained activity of the Sr-90 only. Sr-90, a beta emitter, is in equilibrium with the Y-90 daughter. Thus, a 37 kBq Sr-90 source also contains 37 kBq of Y-90. When comparing sources in similar geometries (i.e., similar backing, cover and source detector distance) good results should be obtained. Sr-90 has an average beta energy of 196 keV and Y-90 has an average beta energy of 934 keV, thus care must be taken when comparing sources of substantially different geometries since effects such as backscatter and window absorption must be considered.

Beta sources SB Type

Planchet source:

Drawing VZ-599-001

Active diameter:

16mm ~2cm2

Overall dimensions:

25mm diameter x 3mm thick

Backing plate:

Aluminium

Note: These sources are calibrated for activity. The emission rate is not calibrated.

Nuclide

Activity

Product code

Cl-36

37kBq

CIR1211

Co-60

37kBq

CKR1211

Co-60

370kBq

CKR1221

Cs-137

37kBq

CDR1211

Cs-137

370kBq

CDR1221

Sr-90/Y-90

37kBq

SIR1211

Sr-90/Y-90

370kBq

SIR1221

Tc-99

37kBq

TCR1211

Tl-204

37kBq

TER1211

Tl-204

370kBq

TER1221

Drawing:

VZ-605-001

Active diameter:

36mm ~10cm2

Overall dimensions:

50mm diameter x 4mm thick1)

Backing plate:

Aluminium

Note: These sources are calibrated for activity. The emission rate is not calibrated.

Nuclide

 

Activity

Product code

Cl-36

37kBq,/p>

CIR1311

Co-60

37kBq

CKR1311

Co-60

370kBq

CKR1321

Cs-137

37kBq

CDR1311

Cs-137

370kBq

CDR1321

Sr-90/Y-90

37kBq

SIR1311

Sr-90/Y-90

370kBq

SIR1321

Tc-99

37kBq

TCR1311

Tl-204

37kBq

TER1311

Tl-204

370kBq

TER1321

Alpha/Beta Anodized Type

Disk Sources

Dish Sources

Active Diameter

Overall Dimensions

Active Diameter

Overall Dimensions

16mm

∅25mm x 3mm

49mm

∅50mm x 3mm

25mm

∅30mm x 3mm

58mm

∅60mmx 3mm

36mm

∅47mm x 3mm

197mm

∅216mm x 12mm

36mm

∅50mm x 3mm

58mm

∅60mm x 8mm

50mm

∅60mm x 3mm

190mm

∅194mm x 3mm

40,6mm

∅50mm x 0,8mm

40mm

∅47mm x 0,8mm

variable

variable