RPD Volume 168 Issue 4 March 2016 comments 2

Influence of the Phantom shape (slab, cylinder or Alderson) on the performance of a HP (3) eye Dosemeter Abstract

In the past, the operational quantityHP (3) was defined to calibration purposes in a slab phantom. Recently, an additional phantom in the form of aCylindeR have been suggested for eye lens dosimetry, asa cylinder much better approximates the shape of a human head. Therefore, this work investigates which of the phantoms, slab or cylinder, was more suitable for calibrations and type Tests of eye dosemeters. For that purpose, a typicalHP (3) eye dosemeter is irradiated ona slab, a cylinder and on a human-like Alderson Phantom(Aldson (Alderson) radiation therapy body model). It turned the response on the three phantoms are nearly equal for angles of radiation incidence up to 45°and Devi Ates only at larger angles of incidence. Thus, calibrations (usually performed at 0°radiation incidence) is practically equivalent on both the slab and the Cylin Der Phantoms. However, type tests (up to 75°or even 90°radiation incidence) should is carried out on a cylinder phantom, as also for L Arge angles of incidence the response on the cylinder and the Alderson Phantoms are rather similar, whereas the response on The slab significantly deviates from the one on the Alderson Phantom.

This paper describes the value of the individual dosage of the eye crystal in the running usage. It was said that the traditional plate body model was used to calibrate the individual doses of the eye crystals, but recently the cylindrical form was recommended for the fixed value of the eye lens dose. The reason is that the cylinder is better approximation of the body's head. In this paper, a kind of ocular crystal dosimeter and three kinds of body modules were used to test the radiation field.

The results show that in the range of 0 degrees to 45 degrees, there is little difference between the three. In the case of large angle, the cylindrical body model and the simulation of human models are still the smallest, but the plate body feel obviously different.

Through the results of the article, we can infer that the angular response of the large angle, the flat body touch has been unable to meet the requirements. Therefore, the cylindrical shape mold is necessary. But how to determine the size, is not to calculate a number of different sizes, or the production of different sizes, to carry out testing, so as to select a reasonable size. Of course, some of the first to calculate the economic and reasonable plan.

RPD Volume 168 Issue 4 March 2016 comments 2