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Ytstrålkällor - Planschetter, Ringar samt Areastrålkällor isotrak (EU)

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Ytstrålkällor producerade av Isotrak

  • Plaschetter
  • Ringar
  • Kvadratiska och rektangulära areastrålkällor
  • Tunna luftprovskällor

Ytstrålkällorna från isotrak används till exempel för lågbakgrundsmätare, hand/fot/personmonitorer och handburna strålskyddsinstrument. Källorna från Isotrak klassificeras med avseende på dess noggrannhet/spårbarhet enligt 

Klass 1 (ISO8769:2016) - emissionsosäkerhet mindre än 3%. Certifikat från primärlabb, t.ex. PTB, NPL..
Klass 2 (ISO8769:2016) - emissionsosäkerhet mindre än 5%. Kalibrerad med certifikat från DAkkS, German Calibration Service. Innefattar även en aktivitetsfördelningsmätning.
Working source (ISO8769:2016) - emissionsosäkerhet mindre än 10%. Certifikat Eckert & Ziegler, EZN
Standardstorlekarna är som följer, men flexibilliteten är god om ni har särskilda önskemål; 

Planschtter: ytterdiameter Ø25 mm, Ø30 mm, Ø47 mm, Ø50 mm, Ø60 mm, Ø194 mm
Tunna luftprovskällor: diameter:  Ø47 mm, Ø50 mm
Diskar:  Ø50 mm, Ø60 mm,  Ø216 mm
Area: 100 x 100 mm, 100 x 150 mm

Construction
The activity is incorporated in the top surface of an aluminium foil resulting in a source which has an active layer only 5 μm (0.8 mg/cm²) in depth. The source is also robust. To produce anodized foil sources, micropores are etched into the surface of a 0.3 mm thick aluminium foil. The micropores are less than 0.01 μm in diameter, and are 4-10 μm deep. The active material is then incorporated in the pores in an insoluble chemical form. The pores are chemically sealed to produce a thin layer which is mechanically robust and chemically resistant. To construct a rigid source, the aluminium foil is mounted on a backing plate.

Emission rate
The quantity of interest for wide area reference sources is the particle emission rate. The particle emission rate is measured using a high efficiency windowless and/or windowed proportional counter, which is calibrated using a Class 1 source. All particles which are emitted from the surface with an energy greater than 590 eV are detected. A particle emitted by a decaying nucleus can be scattered by the source material, or can lose energy in a series of inelastic collisions. The probability of high angle scattering of an alpha particle is very low, and the energy loss in inelastic collisions is low (until the alpha particle reaches the end of its range). For an alpha source, the emission rate is therefore approximately half the activity. Beta particles are deflected relatively easily, and low energy beta particles can quickly lose energy. Consequently, backscatter from the source backing plate and self-absorption of particles in the source material are more significant, and the emission rate can be greater or less than half of the activity, depending on the end-point energy of the beta particles.

Uniformity
The uniformity of each source is checked in accordance with ISO8769.

Uncertainties
The reported uncertainty is based 2 sigma, providing a level of confidence of approximately 95%. Sources are offered with a choice of DKasS certificate (measurement uncertainty less than 5%) or Eckert & Ziegler Nuclitec GmbH certificate (measurement uncertainty less than 10%). Sources that are greater than 100 cm² in area are in addition classified as class 2 or working sources. For Class 2 sources, the uncertainty in the particle emission rate and activity is less than ±5%. For natural uranium sources the uncertainty in the activity is ±10%. For Working sources, the uncertainty in the particle emission rate and activity is less than ±10%.

Tolerances
The maximum deviation of the delivered activity from the nominal activity is ±30%. Other tolerances are available on request.

Availability
Sources are normally delivered within 6 weeks