Remah Volcano (RV) is one of the numerous volcanoes that are distributed in three volcanic fields in the Jordanian Harrat, northeast Jordan. The RV is about 4 km 2. It is about 80 m high. They are arranged in three main horizons: lower, middle, and upper and show planar stratification. 222 Rn content has been measured by using Nuclear Track Detector (Columbia Resin CR-39) studied rocks show that the range from 945-1283 (Bq/m 3) and the average of 1104.46 (Bq/m 3), the highest content of 1175-1283 (Bq/m 3), is recorded in the samples from the upper horizon from RV. 222 Rn ranges between 1049-1125 (Bq/m 3) as shown in the middle horizon and have contents of 945-999 (Bq/m 3), in the lower horizon. The 238 U concentrations increase gradually upwards, respectively. This study concludes that the correlating of contents of 238 U contents with 222 Rn concentrations results obtained in this study it's clear that the 222 Rn-concertation shows a distinct increase as 238 U contents increases. This can lead to the conclusion that the 238 U-decay is the main source that is produced 222 Rn from the interstitial glass which resulted from residual melt in tephra rather than from emission of inferred source in cracks and fractured of inferred faults.

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This article was conducted to measure radon concentration levels in the Yarmouk River Basalt (YRB), North-Jordan. The YRB is of Quaternary in age and occurred as a successive sheet with a total thickness of 122 meters. The Yarmouk River Basalt is classified into four major phases. Namely, Yarmouk Sheet basalt, Yarmouk blocky basalt, Yarmouk massive basalt, and Yarmouk exfoliated. Furthermore, each major phase is subdivided into several flows. Sixteen samples are measured by using Nuclear Track Detector (Columbia Resin CR-39) in the laboratory. The results show that the concentration of radon is gradually decreased from the lower basalt first phase towards the upper fourth phase in considerable amounts. The values range from 12413.12 to 4137.71 Bq/m3, with an average value of 6635.74 Bq/m3. The results of this investigation indicate that the uranium isotopes element decay is the origin of radon emitted from the interstitial glass in the basalt rocks, rather than 222Rn emission along with fractures or major faults.