Natural gamma radiation emitted by the soil and measured at the surface with a gamma ray spectrometer is a function of the radioactive activity of the soil and the linear attenuation coefficient. The dependence of the linear attenuation coefficient on soil water content is explored for selected soil water profiles by numerical integration. These soil water profiles were generalized distributions based on gravimetric measurements over a sandy soil at the Central Experimental Farm in Ottawa. A comprehensive analysis of the measurements showed that inhomogeneous water distribution accounted for a 1.8% error in the count rate compared to a 2.6% error associated with random count rate fluctuation and instrument error. The depth of the soil layer contributing to natural gamma radiation at the surface depends also on the water content; 90% of the total radiation is contributed by a dry soil of depth 0.18 m, compared to 0.14 m for a soil with a fractional water content of 0.2. The total expected error in the measurement over the range of soil water encountered (0.03–0.24) is shown to be 0.033 for the 0.10‐m layer and 0.025 for the 0.25‐m layer.
A pilot pz,oject uas eqrried out in 1977 ouer the Lake Supez'ion basin to measLlre aq.Ler storage on the Land ay,ea using aez,'Lal gotrnq,-r,aA speetrometry to pz.ouide hgdrologic infoz,mation for foz,ecasting inflou to the Lake. T\,so airborne sL&1DelJs uere made, r'espeetiueLy in Nouembey, 1977
A stoy,rntate? manngement study has been initiated in the Lower poz,tion of the Rideau Riuez. basin uithi.n the RegionaL l.tunLetpalita of ?ttcua-Cayleton. The pwpose of the study is to estabLish the aseimilq,tiue capacity of the z,iuer and pollutqtt Loadings fz.om utpstream qtd urbqt souyces uith the aLm of deueLoping the most eost-effeetiue uqA of eontz,ol-Ling poLLutqtts so as to maintain utd possibLy enhanee the z,eez'eqtionaL use of the Rideau uatezuay uithin the urbffi area. Ihe objeetiues qnd mqjor actiu'Lties of the study are outLined after a bz"Lef re1)iea of pz.esent stox,rn'satey mcnagement faeLlities. RESUME: Une 6tude d.e La gestion des eaun pLuuiaLes a 6td entz,eprtse dqts La partie tubqnis1e du bassin de La rLuie're Rideau d L'int6rLeuw de La rm,tnieLpq,Litd z.1gionale d'Ottona-CarLeton. Le but de L'Ahfie est dtdtabLir La eqDacitd d'assi-rrLLqtion de La riuieive Rideau et Les chatges poLluuftee 6manqtt de sources L4ybaines de L'qnont de La rtuidre. Ceci permettra de d4uelopper La fagon La plus efficace et La plus v,entable de contx6'Ler Lq, polLution afin de mainteniT et peut-€tz'e d'augmenten L'usage r6er6atif de eette uoie naaigable dans La z,6gion Lu,baine. Les objeetifs et Les actiuit1s mqjeures de L'6tude sont d6cz"Lts apz,ds wze bz,e'ue reuue des dlspositifs de contz,67e d.es eatw pluuiaLes.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.