A gauge for measuring the dose rate and activity of ophthalmic applicators

• Autorzy: Machaj B. , Świstowski E. , Do H. C. , Bilski P. , Olko P.
• Języki publikacji: EN

Abstrakty

EN

A gauge was developed for determining the dose rate distribution and surface activity of ophthalmic brachytherapy applicators, particularly for 106Ru applicators. A plastic fi 2×2 mm scintillator is used as the radiation detector, featuring a high pulse count rate, which results in a low 0.5% random error, due to good counting statistics. Automatic gain control of the photomultiplier tube (PMT) is achieved using a LED as the reference light source. The PMT operates in pulse mode. Long term gain variation due to fatigue of the PMT or ambient temperature variation is thus compensated for. The count rate error due to inaccurate setting of the high voltage supply of the PMT is 0.4%, and the instability error over 7 hours of continuous operation does not exceed 1-2%, peak-to-peak.

Słowa kluczowe

EN

dose rate; measurements; 106Ru ophthalmic applicators

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2002
• Tom: Vol. 47, nr 3
• Strony: 107--111
• Opis fizyczny: Bibliogr. 3 poz., rys.

Twórcy

autor

Machaj B.

• Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland, Tel.: [phone], Fax: [phone]

autor

Świstowski E.

• Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland, Tel.: [phone], Fax: [phone]

autor

Do H. C.

• Institute of Nuclear Chemistry and Technology, 16 Dorodna Str., 03-195 Warsaw, Poland, Tel.: [phone], Fax: [phone]

autor

Bilski P.

• Health Physics Laboratory, Institute of Nuclear Physics, 152 Radzikowskiego Str., 31-342 Kraków, Poland

autor

Olko P.

• Health Physics Laboratory, Institute of Nuclear Physics, 152 Radzikowskiego Str., 31-342 Kraków, Poland

Bibliografia

• 1.De Almeida C, DeWerd L, Jarvinen H, Soares CG (2000) Guidelines for the calibration of low energy photon sources and beta-ray brachytherapy sources. IAEA Report No. DMRP-200002.IAEA, Vienna
• 2.Evans RD (1970) The atomic nucleus. McGraw-Hill Book Company, New York, Toronto, London
• 3.Fluhs D, Heintz M, Wieczorek C (1996) Direct reading measurement of absorbed dose with plastic scintillators. The general concept and applications to ophthalmic plaque. Med Phys 23:427–435