Synthesis And Stereochemistry Of Optically Active Telluronium Salts

Kamigata, Nobumasa; Urakubo, Tomonari; Shimizu, Toshio

doi:10.1080/10426509808545980

Phosphorus, Sulfur, and Silicon and the Related Elements

1998

DOI: 10.1080/10426509808545980

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Synthesis And Stereochemistry Of Optically Active Telluronium Salts

Nobumasa Kamigata

Tomonari Urakubo

Toshio Shimizu

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Cited by 2 publications

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Synthesis, reactions and structures of telluronium salts

Захаров¹,

Sadekov²

2006

Russ. Chem. Rev.

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Successful radiotherapy relies on accurate dose measurement. Traditional dosimeters such as ion chambers, TLDs and diodes have disadvantages such as relatively long measurement time and poor spatial resolution. These drawbacks become more serious problems for dynamic beams (i.e. with the use of dynamic wedges or even the intensity modulation technique). X-ray film, an integrating dosimeter, may not be associated with the above disadvantages and problems. However, there are several major issues regarding use of x-ray film for routine dosimetry, including the over-response of the film to low-energy photons, variations in the dose response curve (nonlinearity), lack of reproducibility due to variation in processing, etc. This paper addresses the first problem. That is, x-ray film over-responds to low-energy photons (energies below 400 keV), and thus generates unacceptably inaccurate dosimetric data compared with ion-chamber data.To overcome the over-response problem of x-ray film in a phantom, a scintillation method has been investigated. In this method, a film is sandwiched by two plastic scintillation screens to enhance the film response to upstream electrons, and therefore minimize the over-response caused by low-energy photons. The sandwiched system was tested with a 4 MV linac beam. The result shows that, depending on the uniformity of the scintillation screens, the depth-dose distribution obtained from the sandwich system can be made to agree well with that obtained from ion chambers. However, the required high degree of uniformity remains a challenge for the scintillation screen manufacturers.

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Synthesis, reactions and structures of telluronium salts

Захаров¹,

Sadekov²

2006

Russ. Chem. Rev.

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Synthesis and Stereochemistry of Optically Active Selenium and Tellurium Compounds

Kamigata

2005

Phosphorus, Sulfur, and Silicon and the Related Elements

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Synthesis And Stereochemistry Of Optically Active Telluronium Salts

Cited by 2 publications

References 4 publications

Synthesis, reactions and structures of telluronium salts

Synthesis, reactions and structures of telluronium salts

Synthesis and Stereochemistry of Optically Active Selenium and Tellurium Compounds

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