Owens Scientific -- Radioactive Check Source (541 µCi)

Small Business / Woman Owned, HUB Certified - State of Texas

23230 Sandsage Lane
Katy, Texas 77494-4207
Phone: (281) 394-2311
Fax: (281) 394-2522

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Health Physics : Radioactive Check Source (541 µCi)

Radioactive Check Source (541 µCi) Model 30-658 Introduction The Radioactive Check Source (541 µCi), Model 30-658, provides the Medical Physicist with an easy way to check the constancy of response of flat plane-parallel type ionization chambers. The device contains 20 MBq of 90-Sr in a fully shielded container, and is equivalent to ISO Class C64444. Holders for reproducible chamber positioning during check measurements are available for the Markus, Advanced Markus, and Roos ion chambers. If this device is used with other types of chambers, proper positioning becomes the responsibility of the user. Applications Use of the Radioactive Check Source (541 µCi), Model 30-658, is recommended for high precision dosimetry and is required by IEC 60731 - Dosimeters with ionization chambers as used in radiotherapy, 1977. A check measurement performed before each dose measurement will assure the ionization chamber is responding properly. Since the radioactive source is cylindrical, the entrance window of the flat plane-parallel is placed near the source by means of the appropriate holding device. Check readings must be corrected for the 28.7 year half-life of the 90-Sr source. However, under constant environmental conditions (temperature, pressure, air humidity) the current produced in an ionization chamber is reproducible with an uncertainty of +/- 1%. When making check measurements with the Radioactive Check Source (541 µCi), Model 30-658, care must be taken to obtain temperature equilibrium between the ionization chamber, check device, and the surrounding environment. After use, the protective cover should be replaced and secured. With the protective cover in place the dose rate from the source is reduced to less than 1 µSv/h at 10 cm. Leaving an ionization chamber in the check device when not in use is not recommended since this can damage the ion chamber. Note: A radioactive materials license fo rthe 90-Sr is required for purchase.

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