Experimental study on measurement of short pulsed and high-dose-rate X-ray by therapeutic grade ionization chamber / 中华放射医学与防护杂志
Chinese Journal of Radiological Medicine and Protection
; (12): 626-630, 2021.
Article
in Chinese
| WPRIM (Western Pacific)
| ID: wpr-910367
Responsible library:
WPRO
ABSTRACT
Objective:
To investigate the application of therapeutic grade ionization chamber to rapid measurement of short pulsed and high-dose-rate X-ray.Methods:
The half-value layer of pulsed X-ray caused by an electron accelerator was measured by interpolation method and its equivalent energy was estimated. The cumulative doses from a certain amount of pulsed radiation at different distances in the same direction around the equipment were compared using the therapeutic grade ionization chamber and thermoluminescence measurement method . The relationship between the measurement result by using ionization chamber dosimeter and the distances away from source was analyzed. The cumulative doses from a certain amount of pulsed radiation at the same location at different frequencies were compared.Results:
In working condition, 100 pulses of radiation were received accumulatively at 1 to 12 meters away from the outer wall of the equipment. The range of air Kerma was 0.08-9.65 mGy measured by using thermoluminescence dometers and 0.08 - 9.85 mGy using the ionization chamber dosimeters, respectively. The difference between both is within 10%. At different frequencies (1-10 Hz), there was no significant difference in X-ray air Kerma from 100 pulses measured by ionization chamber dosimeter at 2 m away from the front of the equipment ( P>0.05).Conclusions:
The therapeutic grade ionization chamber dosimeter can be used for the rapid measurement of short pulsed X-ray radiation dose in the range of dose rates and pulse frequencies involved in the experimental accelerator device.
Full text:
Available
Database:
WPRIM (Western Pacific)
Language:
Chinese
Journal:
Chinese Journal of Radiological Medicine and Protection
Year:
2021
Document type:
Article