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The measurements of thoron, radon and their decay products thanks to Pinocchio, Tengu and Trolls

2010; Oxford University Press; Volume: 141; Issue: 4 Linguagem: Inglês

10.1093/rpd/ncq248

1742-3406

L. Tommasino, Shinji Tokonami, P. M. Tommasino,

Radioactive contamination and transfer

In the present paper, the long noses of Pinocchio, Tengu and Trolls are used to measure, respectively, radon, thoron, and their decay products both by track-etch detectors and by Geiger–Müller (G–M) counters. Just recently, four new passive samplers (termed quatrefoil) have been developed which greatly simplify the detection of all airborne radionuclides by using either passive or real-time detectors. In particular, surface-deposited radon (thoron) decay products are sampled by films with large area and small surface density (0.1–1 mg cm−2). Once exposed, these films are stacked together for their detection by a pancake G–M counter. For the measurements of radon and thoron in soil, 25-cm-long tubes with sampling films along their internal surfaces can be successfully used. Once exposed, these films can be counted by a pancake G–M for the selective measurement of radon and thoron.