The final safety that puts trash high deals with is deep geology deals with accordingly, radionuclide is in along with groundwater the migratory behavior in geological layer and rule already became current world nucleus the research task that the developed country begins actively. Nuclein leaves the migratory course of current everywhere in rock, accompany have 3 kinds of physico-chemical effect, namely what dispersion, adsorption and nuclein ion flow along with groundwater is macroscopical and migratory in nuclear fission child, put one of nuclide that the need in trash takes seriously high, it is very difficult by geological medium adsorption, easily return mankind environment. The main geology that granite is location of field of preelection of library of our country Gao Fang waste disposal is tectonic, to evaluate granite to regard Gao Fang as trash deep geology deals with the feasibility of country rock, this job uses the mathematical processing technique of linear regression, determined to smash at the same time with clock law model the spread of granite and right block sluggish factor; It is indicator with HTO, with constant source law determined to smash model the spread of granite, the spread that measures to 2 kinds of methods undertakes comparative.
1 experiment part water of 11 reagent tritium, activity concentration is 3710Bq/mL, institute of isotope of academy of science of Chinese nuclear energy is offerred, chroma is become with imitate groundwater dilute before using for 8633Bq/mL; In NHOH, activity concentration is 2035Bq/mL, chroma is become with imitate groundwater dilute before using for 323910 phenyl Zun (PPO) , twinkle pure, all be Shanghai reagent one factory product; 2 oxygen 6 annulus, the analysis is simple, product of limited company of fine chemical of essence of the benefit in Beijing beneficial; Naphthalene, the analysis is simple, product of Beijing chemical plant. G naphthalene, the dilute after with 2 oxygen 6 annulus dissolve comes 5L.
12 instruments and equipment exceed low background fluid to show chart appearance, background is 159minWallac company product; BSZ-100 is collected automatically partly implement (add SJX-3 number plan drop implement) , shanghai Lu Xi Yi implement factory product; CL-25 device exceeding filter, machine of dynamoelectric shake sieve, the Yu Fufei on Zhejiang province amounts to experimental factory product; Dispersion column, self-restrained, accord with be more than a diameter the requirement of 15 times, wet hold post, squeezing ramming hind reserves.
13 mineral material and sample are mineral material: Take the granite core with the deep 600700m below country of Gansu Province north, via smashing, after sift out, amass 04509mm share, use fine bit of eliminate of ionic water full, 70 drying reserve. Imitate groundwater sample: 2 times with 50L according to 1kg granite powder the scale of distilled water mixes, sealed in high-pressured stainless steel in coal tub, connect argon to enrage (pressure is 25MPa) , immerse 220d, filter for the film exceeding filter of 10000 through holding back opposite element quality, filtrate reserves.
Undertake on the dispersion column that solution is in the imitate groundwater that 1.4 experiments method shows trace with tritium water to be 1215cm high constant the hydraulic dispersion experiment of the source. After from above to below of tritium aqueous solution has shed dispersion column, with collect implement collect exit to carry sample and be in exceed low background fluid undertake metrical on Shan Puyi, get the hole of dispersion column is led. After the tritium water that goes up with column of dispersion of distilled water wash out, let imitate groundwater flow downward from the coping of column, and instantaneous solution, the hydraulic dispersion test of clock has on this dispersion column. The Tc of computation of mathematical processing technique that uses linear regression is in smash model the spread in granite and block sluggish factor.
It is tracer for water of fluid, tritium with imitate groundwater, undertake on the dispersion column that is 280cm high in column constant the hydraulic dispersion experiment of the source. From above to below of tritium aqueous solution has shed dispersion column, in exit end collects sample and measure, with the mathematical processing technique that linear drafts to close computational tritium water is in smash model the spread in granite.
2 results and discuss dispersion of 21 dispersion theory to include an element to diffuse with mechanical dispersion. The nuclide that packs the soak in body from trash is in be worn by the existence in the geological layer of water saturation chroma is poor, because this meeting produces an element diffuse; Because size of aperture of liquid viscosity, rock is differ and tortuosity of a narrow passage providing the only means of access to a certain place, make body of midstream of each a narrow passage providing the only means of access to a certain place produces speed to distributing, make thereby solute forms chroma difference, liquid of different pH indicator mixes to form mechanical dispersion.
Assume the migratory process of nuclein occurs in parallel only at current direction, be like X axis direction, assume free water is in the diffusion coefficient in medium is constant, grow those who be L to diffuse medium is even, take no account of nuclein the disintegration in migratory process, criterion in the process that current been sheddinging hole medium, the total effect of all sorts of different processes can express with quality conversation law: Assume nuclein is in the adsorptive allocation in solid photograph to be constant than K, go up type can change brief for: In type, go up in type, c is the mass concentration of the solute in fluid photograph, g/mL; S is the quality of the solute in the hole medium of quality of the unit in solid photograph; For accumulation density, g/cm is hole rate; For rate of effective small opening; T is time, s; X is the distance on X direction, cm; Q is for molecular diffusion coefficient, cm Liu Dejun: Smash model the spread of granite determines for mechanical dispersion coefficient, cm is hydraulic dispersion coefficient, for block sluggish factor; V is hole velocity of flow, cm/s; For spread, cm.
Flow when water when rate is older, negligible element diffuses, right now water motivation dispersion basically results from mechanical dispersion action 22 spread and block sluggish factor while determine hole of 221 dispersion column leads determine to be a fluid with imitate groundwater, tritium Shui Zunheng decides source tracer, hydraulic dispersion test has on the dispersion column that is 1215cm high, determine the hole rate of dispersion column. The experiment gives water mouth sampling in dispersion column endmost hind, determine to concern along with the change of time, gotten consistency penetrates the curve is shown at the graph 1.
As a result of tritium water not by medium adsorptive or stop, because this basis is lubricious the layer is academic: V is equivalent to dispersion column bulk, =AL, a and L are the cut area of dispersion column and height respectively; Represent half penetrable bulk, the bulk of dispersion column is poured out of when C/c=0.5 namely, v represents half penetrable time, the time of dispersion column is poured out of when =0.5, v uses from above to below of tritium aqueous solution to flow for bulk shedding experiment exorbitant the dispersion column that is 1215cm, in the exit of dispersion column end collects sample and measure.
3 conclusion (1) it is a fluid with imitate groundwater, with be not being decided by the poriferous medium adsorption, tritium Shui Zunheng that stop the tracer of the source has hydraulic dispersion test, measure so that hole leads =0.445; Have hydraulic dispersion test in order to make the tracer of clock, adopt the mathematical processing technique of linear regression, get smashing at the same time model the spread =0244cm of granite, smash model granite is right the R of block sluggish factor of Tc (2) it is a fluid with imitate groundwater, with tritium Shui Zunheng decides the tracer of the source to have hydraulic dispersion test, get smashing model of granite (3) clock law and constant the spread that source law place measures is basic and same, showing spread is the character of medium itself only.
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