Study on source thickness and counting efficiency calibration for determining gross alpha activity in drinking water / 中华放射医学与防护杂志
Chinese Journal of Radiological Medicine and Protection
; (12): 937-940, 2021.
Article
in Chinese
| WPRIM (Western Pacific)
| ID: wpr-910420
Responsible library:
WPRO
ABSTRACT
Objective:
To study the influence of source thickness and counting efficiency calibration on the measurement of gross alpha activity in water.Methods:
241Am and natural uranium reference materials were spiked in drinking water to prepare source on a planchet with different thickness, for counting alpha activity on the planchet.Results:
The effective thickness measured by spiking 241Am or uranium standard solution in water sample was consistent with the empirical value of 4 mg/cm 2. The alpha counting rate was in a linear increase trend from 2A-5A mg/cm 2 and was basically stable and no longer increase when thickness was higher than 10A mg/cm 2 (A was area of planchet). The result calculated by effective thickness method and thick source method were in good agreement when thickness was 10A mg/cm 2.Conclusions:
In order to reduce the deviation of gross alpha counting rate caused by the source thickness and counting efficiency calibration, the source thickness is recommended to be 10A mg/cm 2.
Full text:
Available
Database:
WPRIM (Western Pacific)
Type of study:
Prognostic study
Language:
Chinese
Journal:
Chinese Journal of Radiological Medicine and Protection
Year:
2021
Document type:
Article