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Toothpaste has importance in environmental and biological studies because of its daily usage by humans and its ability to transport radon gas to the teeth when this sample contains radiation like alpha particles; therefore, the purpose of this study is to determine and measure the concentration of radon concentration (alpha particles) emitters from the toothpaste samples with the impact of radioactivity in the toothpaste on the teeth and transfer this effect to the teeth of the volunteer, by using CR-39 NTDs and natural method (passive method) and PVC tube. The alpha emitter’s concentration in the toothpaste samples varies from 0.3557 to 0.7193 ppm and in teeth samples from 0.0089 ppm to 0.0161 ppm. The results showed that the radon concentration in toothpaste samples was lower than the global permissibility limiting of exposure to radon 200 Bq m −3  and the average annual effective dose in the studied samples was in the range of about (1.837 mSvy −1 ), which was below range (3–10 mSvy −1 ) reported by the ICRP (1993). Therefore, there is no evidence of health problems and human teeth in safe. A significant strong positive correlation was found ( r  = 1,  p  &lt; 0.000) between the concentrations of alpha emitters in toothpaste and in teeth, depending on the volunteer’s age, the allergic reaction of the body to radiation because the concentrations of alpha emitters increase with an increase in age.

Monitoring and investigating the alpha emitter’s concentration in toothpaste and teeth, using CR-39 NTDs