The inverse-square gamma-irradiation anomaly of the Nuclear Enterprises 2575 large-volume ionisation chamber. Issue 4 (13th October 2014)

• Record Type: Journal Article
• Authors: Bielajew, Alex F.; Tessier, Frédéric; El Gamal, Islam
• Is Part Of: Radiation protection dosimetry. Volume 167:Issue 4(2015)
• Page Start: 385
• Page End: 391
• Publication Date: 2014-10-13
• Subjects: Radiation dosimetry -- Periodicals; Radiation -- Safety measures -- Periodicals; 363.1799
• DOI: 10.1093/rpd/ncu306
• Languages: English
• ISSNs: 0144-8420

Abstract

Abstract: The Nuclear Enterprises (Model 2575) 600 cc ionisation chamber is examined to discover the cause of its anomalous behaviour in inverse-square stability measurements. Measurements and Monte Carlo calculations are employed to isolate the cause of the discrepancy. It is found that most of the effect is due to the long photon attenuation pathlengths in the long side wall of the instrument. A phenomenological procedure, based on measurements, is proposed to correct for the anomaly. The procedure results in inverse-square stability to within 0.5 % over a range of 1–7 m.