Physical and engineering problems of small shield design

Kukhteevich, V. I.; Tsypin, S. G.

doi:10.1007/bf02276885

Cited by 1 publication

(1 citation statement)

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“…The linac head leakage was assumed to originate from the virtual point source through the linac shielding. Without thorough knowledge on the exact phenomena taking place at shielding level, we took advantage of the approach commonly applied in the field of nuclear physics to account for scattered photons when measuring ionising radiations transmitted through a shielding material (White 1950, Kukhteevich and Tsypin 1959, Deatanyah et al 2011, Singh and Badiger 2014. The dose, D head (x, y, z, f), due to photon leakage at the point of calculation P(x, y, z), for the field size f, was thus evaluated as follows:…”

Section: Linac Head Leakagementioning

confidence: 99%

Field size dependent mapping of medical linear accelerator radiation leakage

et al. 2015

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The purpose of this study was to investigate the suitability of a graphics library based model for the assessment of linear accelerator radiation leakage. Transmission through the shielding elements was evaluated using the build-up factor corrected exponential attenuation law and the contribution from the electron guide was estimated using the approximation of a linear isotropic radioactive source. Model parameters were estimated by a fitting series of thermoluminescent dosimeter leakage measurements, achieved up to 100 cm from the beam central axis along three directions. The distribution of leakage data at the patient plane reflected the architecture of the shielding elements. Thus, the maximum leakage dose was found under the collimator when only one jaw shielded the primary beam and was about 0.08% of the dose at isocentre. Overall, we observe that the main contributor to leakage dose according to our model was the electron beam guide. Concerning the discrepancies between the measurements used to calibrate the model and the calculations from the model, the average difference was about 7%. Finally, graphics library modelling is a readily and suitable way to estimate leakage dose distribution on a personal computer. Such data could be useful for dosimetric evaluations in late effect studies.

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Section: Linac Head Leakagementioning

confidence: 99%