MEASUREMENT OF AMBIENT CARBON-14 BY USING THE GEL SUSPENSION COUNTING METHOD. Issue 3 (30th April 2019)

• Record Type: Journal Article
• Authors: Chen, Qianyuan; Chen, Chongyang; Zhuo, Weihai
• Is Part Of: Radiation protection dosimetry. Volume 184:Issue 3/4(2019)
• Page Start: 405
• Page End: 408
• Publication Date: 2019-04-30
• Subjects: Radiation dosimetry -- Periodicals; Radiation -- Safety measures -- Periodicals; 363.1799
• DOI: 10.1093/rpd/ncz066
• Languages: English
• ISSNs: 0144-8420

Abstract

Abstract: For monitoring the ambient 14 C, the CaCO3 suspension counting method was established in this work. In the preparation of CaCO3 powder, a two-stage sampler with 3 mol L −1 NaOH absorbent was designed to collect the ambient CO2 at a sampling flow rate of 1 L min −1, and then the CaCO3 was precipitated by adding saturated CaCl2 solution. By using 2 g of CaCO3 powder, 4 mL double-distilled water and 14 mL scintillation cocktail, the lower limit detection could reach 20.0 mBq m −3 by using a commercially available low background liquid scintillation counter. Co-comparison experiments showed that the activity concentration of 14 C measured by the gel suspension counting method consisted well with the results of other three methods. It indicates that the CaCO3 suspension counting method is also a practical method for routine monitoring of ambient 14 C.