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Alpha particles are counted instead of neutrons. When a thermal neutron counting rate is 500 cpm, what is the thermal neutron flux? Assuming the efficiency of 1 5-count per reaction. Data : / Filled with 100% enriched B10F3 gas at p = 10 cmHg, and T = 20)4 in a detector volume of 80H6. / The average absorption X-section of B10 at 20)4 is 3,553 b. <Solution> The number of B10 atoms in the chamber, The average absorption X-section of B10 (1/v absorber) is 3,553b. Hence, the total reaction rate becomes, Problem 2 (20 points) : 5 measurements taken. Gross for 10 minutes and background for 20 minutes for each measurement. The results of measurement are as follows : <Measurement><Gross Counts><Background Counts> <1><230><22> <2><229><21> <3><228><20> <4><227><19> <5><234><23> Find the net count rate (cpm) with standard deviation. <Solution> Let 6 gross count rate (including the background count rate) = , and 6 background count rate = , then 6 net count rate = ( where, , ) In this problem, Hence, net count rate with standard deviation is, Problem 3 (20 points) : In case of air-submersion doses by radioactive noble gases, explain that the external radiation is completely controlling compared to lung or absorbed doses. <Solution> All the radioisotopes of noble gases emit either photons or 5-particles of considerable energy. For skin and tissues near the surface of the body, Hence, for noble gases, the external radiation is completely controlling compared to lung or absorbed doses. 84 Nomenclature / : relative mass stopping power of tissue ( 41) / : geometrical factor determined by the dimensions of a person & the range of the radiations / : geometrical factor to allow for shielding by overlying tissue / : geometrical factor / : mass of the lungs (1,000 g) / : average volume of air contained in the lungs ( 43410-3 I6)  _