Comparison of the methods for eye lens dose measurement by a Monte Carlo method

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21460%2F17%3A00314864" target="_blank" >RIV/68407700:21460/17:00314864 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1007/s00259-017-3822-1" target="_blank" >http://dx.doi.org/10.1007/s00259-017-3822-1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00259-017-3822-1" target="_blank" >10.1007/s00259-017-3822-1</a>

Result language

angličtina

Original language name

Comparison of the methods for eye lens dose measurement by a Monte Carlo method

Original language description

The first system (SMELE-1, S1) uses the TLD located at base of the nose root. The S-2 uses two TLDs in positions above the eyebrow. The S-3 is the system EYEDTM developed in ORAMED project for intervention radiology. The MC code MCNPX and Zubal voxel head phantom with the SMELEs pinned on protective eyewear were used for calculation of angle dependence of the SMELEs responses and exposures of eye lenses irradiated by 137Cs, 131I, 99mTc, 90Y, 18F and 11C point sources from angles 0°, 45°, 90° and 180° at distance of 50cm. The comparisons of the SMELEs responses and the values of eye lens exposures were performed in the same amount of averaged absorbed dose. The use of voxel head phantom allows to simulate details of the human head form face and internal structure of its tissues and cavities. The eyes created by means of mathematical formulas contains simple constructed lenses and they were inserted into the Zubal voxel phantom to achieve a higher accuracy in the determination of the Daverage in the eye lenses. MCNPX simulations were verified for the MCP-7 located on the PE calibration cylinder phantom of diameter 20cm irradiated by 137Cs source from distance of 90cm. All SMELEs have been calibrated by the cylindrical water phantom point source 137Cs at distance of 100cm in front and side of irradiation geometries. The value Daverage measured by the systems for monitoring radiation exposure of lenses were in all considered irradiation geometries higher than Daverage monitored by dosimeters located on the chest. According to results of the simulations of angle dependence of the SMELEs responses, better agreements of the Daverage values of eye lenses exposures were with the responses of S-1 and S-2. Monitoring of Daverage on the chest is not sufficient for the assessment of the exposure of the eye lens in the departments of nuclear medicine. S-2 is recommended as a monitor of eye lens irradiation because this system is able to distinguish which eye received higher dose.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

30305 - Occupational health

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů