The isomeric thermal neutron cross section and isomeric resonance integral of 109 Ag(n, γ) 110m Ag, 133 Cs(n, γ) 134m Cs and 134g Cs, and 136 Ba(n, γ) 137m Ba reactions were investigated together with 115 In(n, γ) 116m In monitor reaction. These residual nuclei have broad half-life time scale suitable for our investigation. Moderated neutrons from steady AmBe source were used for activation of samples with natural abundances. Field was monitored and mapped using gold and indium activation. The formulae used for neutron activation analysis were derived with emphasizing the different interpenetrations of cadmium transmission factor and self-shielding factors. The k 0 -factor for γ-rays in the residual nuclei were measured. The isomeric thermal neutron cross section and resonance integral for 115 In(n, γ) 116m In were evaluated to be 162.6 b and 2585 b. These data were used to measure the k 0 -factors; and compared to reported values to confirm the procedure. The thermal neutron cross section and resonance integral for 133 Cs(n, γ) 134m Cs were found to be 2.64±0.11 b and 42±1.7 b, respectively; while those of the 109 Ag(n, γ) 110m Ag reaction were 4.09±0.35 b and 68±6 b. Thermal neutron cross section for 136 Ba(n, γ) 137m Ba was identified as 0.032±0.003 b, while the resonance integral could not be evaluated as a result of interfering reactions. Model calculations were done using EMPIRE code to simulate isomeric ratio and compared with the experimental results. The feeding of isomeric state from neutron reaction is more sensitive to the variation of neutron flux distribution than the nucleus formation. Steady neutron field could be retained with isotopic neutron source with moderation setup and geometry of suitable homogeneity and isotropy.

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CR-39 plastic detector is one of the most popular radiation detection, because its high sensitivity to protons and alpha particles (1) , CR-39 is used in many fields that contribute to the detection of radioactive materials, including radon gas, which is one of the most dangerous radioactive materials since it is a gas, tasteless and odorless (2) .Radon 222 Rn is a noble element produced from the terrestrial elements uranium isotopes 238 U, 235 U and 232 Th.The molecules of radon gas diffuse out through pore spaces in soils and rocks and mix with the atmosphere. The radon gas has three isotopes, 222 Rn resulted by the decay of 238 U series, 220 Rn resulted by the decay of 232 Th series and 219 Rn a decay produced from the chain originating with U-235 (3) . Inhalation of radon gas leads to lung cancer and this occurs in the unventilated environments where the concentration of gas and its daughters increases.Literature review, from previous studies, it claims that radon gas concentration in soil

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