@article{oai:ir.kagoshima-u.ac.jp:00004515,
 author = {山下, 貞二 and YAMASHITA, Sadaji and 吉福, 功美 and YOSHIFUKU, Isami},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Oct},
 note = {In the application of the gamma-rays penetration to the measurement of the distribution of void fraction in the quiet packed column which contains solid-air and solid-water mixture, it was derived that the correction factor B for the exponential law of attenuation was expressed as follows, using the penetration distance t, the mixed absorption coeffcient μ_m and intensity of gamma ray I, I_m=I_aB exp(-μ_mt) where μ_m=μ_s(1-ε)+μ_{a,w}ε-μa  In the present experiment used 1 1/2" gas pipe with Tokitsu sand, calcium carbonate and red 
lead, the following empirical corretation were resulted：
log B=a log t, λ=a/μ_m≒1 (for δ=0.5cm) 
Combining above relation, it is possible to calculate the distribution of void fraction in a 
pipe which contains mixed phase. Two kinds of error e_1, e_2 defined between calculated and 
measured values of void fraction were 6.37 and 2.61% respectively.},
 pages = {75--84},
 title = {混相流に関する研究 (第5報) : ガンマー線透過法による固液混相流の濃度分布の測定 (その1)},
 volume = {3},
 year = {1963}
}