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Biomedical subjects

T M Ponikarova

Publications and source records attributed to T M Ponikarova.

10 recordsLinked to original sources
PubMed1989

[Levels of internal irradiation of the population of the RSFSR by natural alpha emitters].

The values of regional mean concentrations of natural radionuclides in the teeth samples of the RSFSR residents vary within 130-203 mBk/kg for 238U, 174-490 mBk/kg for 226Ra, 1.8-3.4 Bk/kg for 210Pb, 26-56 mBk/kg for 232Th, 50-150 mBk/kg for 228Th. The mean values of 238U in osseous tissue and teeth are similar and equal 120 +/- 35 and 112 +/- 38 mBk/kg, respectively. Radioactive balance between 228Th and 232Th in osseous tissue is absent. The ratio of the concentration of 228Th/232Th is on the average equal to 2.4 +/- 0.9 and of 220Th/832Th doesn't exceed 1.3. The distribution of regional mean concentrations of radionuclides of uranium and thorium series complies with standard distribution. An annual effective equivalent internal dose obtained because of natural alpha-emitters has been calculated for the population of the RSFSR.

Air Pollutants, Radioactive↗
PubMed1984

[Content of thorium isotopes in human teeth].

The concentrations of Th isotopes were determined in the teeth of persons belonging to 3 age groups (under 7,8-16, over 16) from 10 areas of RSFSR. Differences in the content of 228Th and 232Th in the teeth of persons of various ages living in different areas of the RSFSR are statistically insignificant. There is no balance between them in all the samples. The ratio of their concentrations is on an average 2.4 +/- 0.9. The Th isotope summary irradiation dose absorbed by the osseous tissue is 9.6 X 10(-6) Gy/year.

Adolescent↗
PubMedDate not supplied

[The study of interaction between 134Cs and potassium in system peat soil-plant under increasing concentration of macroelement in soil].

The interaction between analogous elements K and 134Cs in the system "peat-soil-plant" was investigated. The values of some parameters of sorption model for uptake of radionuclides by plants from soil were determined. An attempt to interpret the processes going on in the studied system under pot experiment from the viewpoint of soil chemistry was done. Two intervals of potassium concentration in peat-soil were displayed, with different effect on 134Cs uptake by plants.

Cesium Radioisotopes↗
PubMedDate not supplied

[137Cs accumulation by grasses from peat soil under increasing amounts of potassium and nitrogen fertilizers].

The three-chamber model of radionuclides uptake from soil was proposed. This model permit to analyse the transfer factors as the function of the some properties of the radionuclides, macroelement-analogs, soil and plants. The field experiment results (Novozybkov District) was analysed. In this experiment the uptake 137Cs in Bromopsis inermis L. from peat soil under increasing K- and N-fertilizer doses was investigated.

Absorption↗