What question did this study set out to answer?

The central aim is to establish a low background calibration facility for measuring ionizing radiation effectively.

February 5, 2026

Low background facility for ionizing radiation at LNE LNHB: Design and traceability

JBJ.M. Bordy OKO. Khattabi CCC. Chardeur

Key Points

The central aim is to establish a low background calibration facility for measuring ionizing radiation effectively.
Designed a lead box calibration facility measuring 100 cm x 100 cm x 125 cm with 2.5 cm thick walls.
Utilized a Caesium 137 source in a conical collimator for precise measurements.
Measured ambient dose equivalent rates ranging from 300 to 80 nSv/h.
Achieved a standard uncertainty of about 2% for the ambient dose equivalent rate.
Estimated calibration coefficient uncertainty for the survey meter between 5% and 10%, mostly due to background measurement uncertainty.

Abstract

This paper presents the set up of a low background calibration facility aimed at calibrating environment survey meter. The facility is a lead box 100 cm x 100 cm x 125 cm with 2.5 cm thickness walls, the Caesium 137 source is located in a conical collimator including an internal cavity for the source. The ambient dose equivalent rate in the beam of this facility varies between 300 and 80 nSv/h. This quantity is traceable to the air kerma national references of LNE-LNHB. The standard uncertainty for the ambient dose equivalent rate is about 2% and the uncertainty of the calibration coefficient od a survey meter, depending meanly on the uncertainty if the background measure, is estimated between 5% and 10%.

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