Minirad Products - Product sheet for MR 2802 - Check Source Sr-90  (80MBq)
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MR 2802 - Check Source Sr-90  (80MBq) (Check Source)
for the long-term stability tests of thimble ionization chambers
test

 

Check source MR 2802 is to be used for verification of the long-term stability of ionization chamber sensitivity.

Ionization chamber is placed inside the check source shielding container by means of the exchangeable adapter MR 2802A-*. This design makes possible to use the MR 2802 check source for various ionization chambers, while using appropriate adapter. There is only one limitation - the outer diameter of chamber must be smaller then 13 mm.

Reproducibility of the ionization chamber MR 2101 response measured in the check source MR 2802 is ~ 0.05%.

In the upper part of the check source container is the hole for thermometer. For temperature measurement a glass thermometer can be used (delivered along with the source), or some type of the RTD-sensor series MR 169* are available, the response of which can be evaluated using some of MINIRAD electrometer with TP-module.

Check source MR 2802 - along with the electrometer MR 1115-A and with the precise ionization chambers MR 2101 (0.6 cm3, Farmer type) - forms a Precise Dosemeter which is dedicated to reference measurement in clinical dosimetry. All these parts of the Precise Dosemeter have been designed with respect to the demands on "reference class" equipment following the Standard IEC731 (Medical Electrical Equipment. Dosimeters with Ionization Chambers as used in Radiotherapy).

Check source MR 2802 - along with one of the routine electrometers MR 1202-A, MR 1501-A and with one of the ventilated water-proof ionization chambers MR 2102 (0.6 cm3, Farmer type), MR 2202 (0.3cm3), MR 2212 (0.1cm3) or MR 2302 (0.1cm3) - forms a Routine Dosemeter which is dedicated to all routine measurements in clinical dosimetry.

Technical Data

  • container of the MR 2802 check source has a steel outer coating, filled up with lead
  • inside the container a closed 90Sr radioactive source is firmly placed, the activity of which is 80 MBq
  • dose equivalent on the container surface does not exceed 1μSv/h
  • current value measured in the MR 2802 check source using MR 2101 ionization chamber is usually 100pA,
    reproducibility of the measured current value being 0.05%

Options

  • MR 2802A-1 adapter to MR 2802 for precise ionization chambers MR 2101 a MR 2102 (Farmer-type)
  • MR 2802A-2 adapter to MR 2802 for routine ionization chambers series MR 22** (outer diameter 6mm)
  • MR 2802A-3 adapter to MR 2802 for routine ionization chambers series MR 23** (outer diameter 5mm)
  • MR 2802A-12 adapter to MR 2802 for ionization chambers NE 2561, NE 2611 (‘Secondary Standard’)
  • MR 2802A-13 adapter to MR 2802 for ionization chamber VAK70108
  • MR 2802A-14 adapter to MR 2802 for ionization chambers PTW31002 (233642), PTW 31003 (233641), PTW23323
  • MR 2802A-15 adapter to MR 2802 for ionization chamber PTW23331