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Keith S, Doyle JR, Harper C, et al. Toxicological Profile for Radon. Atlanta (GA): Agency for Toxic Substances and Disease Registry (US); 2012 May.
4.1. CHEMICAL IDENTITY
Radon is a naturally occurring radionuclide. The largest source of radon in the environment is due to the ambient levels produced by the widespread distribution of uranium, thorium, and their decay products in the soil (Buttafuoco et al. 2007; Weast 1980). Radon is a decay product of radium and part of the uranium and thorium decay chains (see Figure 4-1) (Buttafuoco et al. 2007; O’Neil et al. 2006). The chemical identity of radon isotopes and identification numbers for several of the radon isotopes (218Rn, 219Rn, 220Rn, 222Rn, 226Rn, 229Rn, and 230Rn) are listed in Table 4-1.
Figure 4-1
238U Decay Series Showing Sources and Decay Products*. *All of the single transitions are 100%; other branching ratios are shown in the decay series. ↓ alpha (α) decay; ↗ beta (β−) decay or internal transition (IT) (more...)
Table 4-1
Chemical Identity of Radon.
4.2. PHYSICAL, CHEMICAL, AND RADIOLOGICAL PROPERTIES
Radon is the densest of all the gases. Important physical and chemical properties of radon are listed in Table 4-2. The radioactive properties of the important, short-lived daughters of 222Rn are listed in Table 4-3. Figure 4-1 depicts the 238U decay series containing 222Rn. Figure 4-2 depicts the 232Th decay series containing 220Rn (thoron). Figure 4-3 depicts the 235U decay series containing 219Rn (actinon).
Table 4-2
Physical, Chemical, and Radiological Properties of Radon.
Table 4-3
Radioactive Properties of 222Rn and Its Short-lived Progeny.
Figure 4-2
232Th Decay Series Showing Sources and Decay Products. *All of the single transitions are 100%; other branching ratios are shown in the decay series. ↓ alpha (α) decay; ↗ beta (β−) decay or internal transition (IT) (more...)
Figure 4-3
235U Decay Series Showing Sources and Decay Products. *All of the single transitions are 100%; other branching ratios are shown in the decay series. ↓ alpha (α) decay; ↗ beta (β−) decay or internal transition (IT) (more...)
- CHEMICAL, PHYSICAL, AND RADIOLOGICAL INFORMATION - Toxicological Profile for Rad...CHEMICAL, PHYSICAL, AND RADIOLOGICAL INFORMATION - Toxicological Profile for Radon
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