Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Artículo científico |
| Sprache: | en |
| Veröffentlicht: |
Sociedade Brasileira de Proteção Radiológica - SBPR
2019
|
| Schlagworte: | |
| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=722280838004 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Inhaltsangabe:
- A comparison between rad-hard float zone silicon diodes as gamma dosimeter in radiation processing Fábio Camargo Josemary A. C. Gonçalves Carmen Cecília Bueno Biología Rad High dose Silicon diode hard Si diode In this work, we report on the results obtained with rad-hard Standard Float Zone (STFZ) and Diffused Oxygenated Float Zone (DOFZ) silicon diodes in radiation processing dosimetry. The dosimetric probes were designed to operate in the direct current mode, as on-line radiation dosimeter. The irradiation of the samples was performed using a 60Co source with a dose rate of almost 2.4 kGy/h. The current response of each diode was measured as a function of the exposure time in steps from 5 kGy up to 50 kGy to achieve a total absorbed dose of 275 kGy. In this dose range it is observed a significant decrease in the photocurrent generated in both devices due to gamma radiation defects produced in their active volumes. To mitigate this effect, the samples were pre-irradiated with 60Co gamma rays at 700 kGy. Despite of being less sensitive, these devices presented stable and reproducible current signals with a relative sensitivity decrease of about 19% within the whole range of dose studied. The dose-response curves of the pre-irradiated diodes showed quadratic behavior with correlation coefficient higher than 0.9999 for total absorbed dose up to 275 kGy. The comparison of the diodes’ dosimetric responses evidenced that the best result was achieved with the DOFZ, which exhibited slightly higher sensitivity and stability than the STFZ devices. However, it is important to note that all preirradiated diodes can be used as gamma dosimeters in radiation processing applications. 2019 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280838004 en http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2A Vol.7