Naslov
Measurements of secondary radiation doses inside a paediatric anthropomorphic phantom exposed to scanning proton radiotherapy, using different passive dosimetry systems: Activity within EURADOS WG9 (SG2)

Autori
Knežević, Željka on behalf of WG9

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, pp prezentacija, znanstveni

Izvornik
11th International Workshop on Ionizing Radiation Monitoring / Takayoshi, Yammamoto - Ōarai : Chiyoda Technol Corporation (CTC), 2016, 241-250

Skup
11th International Workshop on Ionizing Radiation Monitoring

Mjesto i datum
Ōarai, Japan, 05.12.2015. - 06.12.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
proton radiotherapy; secondary doses; TLD; RPL; paediatric phantoms

Sažetak
Proton therapy is a rapidly growing cancer treatment modality because of the possibility of sparing healthy tissue close to the target volume. Proton beams show an increase in energy deposition with penetration depth up to a sharp maximum at the end of their range and almost no dose is deposited in the normal tissue beyond the Bragg peak. However, the interactions of protons with matter result in the production of secondary radiation comprised mostly of neutrons and gamma radiation. Unwanted doses, deposited distantly from the target volume (out-of-field doses), may lead to an increasing probability of late effects of radiotherapy including the generation of secondary cancers which is of especial importance for children. Around 70% of children with malignant diseases are successfully treated and radiotherapy is most frequent method of treating the tumors. Proton beam therapy has clear advantages in terms of short- and long-term complications which is especially important when tumours are located next to critical organs and while treating cancer in paediatric patients. The hadron therapy sub-group of EURADOS Working Group 9 (Radiation Dosimetry in Radiotherapy) is engaged in a measurement campaign designed to investigate the secondary radiation generated by a scanning proton beam. The first part of the measurement campaign (characterization of the neutron and gamma radiation field inside the water tank phantom using different passive dosimetry systems) was carried out on the active-scanning proton beam therapy facility in Trento, Italy. The second part of the measurement campaign was designed to measure out-of-field organ doses using 5 and 10 year-old anthropomorphic phantoms (CIRS) in the Bronowice Cyclotron Center in Krakow, Poland (IBA Proton Therapy System- Proteus 235). Doses were measured in different organs with thermoluminescent (MTS-7, MTS-6 and MCP), radiophotoluminescent (GD-352M and GD302-M), optically stimulated (OSL) and CR-39 track detectors. The isocenter (at the centre of a sphere 6cm diameter, representing the tumour) was located in the head of the phantom and the applied target dose was 100Gy. The detailed analysis of the results with different dosimetry systems combined with ongoing Monte Carlo simulations will give valuable information about out of field doses.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA