Modelling the Effect of Mechanical Remediation on Dose Rates Above Radiocesium Contaminated Land

2018 ◽  
pp. 259-272
Author(s):  
Alex Malins ◽  
Hiroshi Kurikami ◽  
Akihiro Kitamura ◽  
Masahiko Machida
Keyword(s):  
Contaminated Land ◽  
Dose Rates

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Electron Beam Damage of Biomolecules Assessed by Energy Loss Spectroscopy

1978 ◽  
Vol 36 (3) ◽  
pp. 61-69
Author(s):  
M. Isaacson ◽  
M.L. Collins ◽  
M. Listvan
Keyword(s):  
Electron Microscopy ◽  
Radiation Damage ◽  
Structural Integrity ◽  
Analytical Electron Microscopy ◽  
High Dose ◽  
Dose Rates ◽  
Special Cases ◽  
Analytical Electron ◽  
Atom Migration ◽  
Beam Damage

Over the past five years it has become evident that radiation damage provides the fundamental limit to the study of blomolecular structure by electron microscopy. In some special cases structural determinations at very low doses can be achieved through superposition techniques to study periodic (Unwin & Henderson, 1975) and nonperiodic (Saxton & Frank, 1977) specimens. In addition, protection methods such as glucose embedding (Unwin & Henderson, 1975) and maintenance of specimen hydration at low temperatures (Taylor & Glaeser, 1976) have also shown promise. Despite these successes, the basic nature of radiation damage in the electron microscope is far from clear. In general we cannot predict exactly how different structures will behave during electron Irradiation at high dose rates. Moreover, with the rapid rise of analytical electron microscopy over the last few years, nvicroscopists are becoming concerned with questions of compositional as well as structural integrity. It is important to measure changes in elemental composition arising from atom migration in or loss from the specimen as a result of electron bombardment.

Electron-diffraction studies in synthetic polymer materials

1983 ◽  
Vol 41 ◽  
pp. 362-365
Author(s):  
D.T. Grubb
Keyword(s):  
Electron Diffraction ◽  
Synthetic Polymer ◽  
Polymer Materials ◽  
Crystallographic Structure ◽  
High Dose ◽  
Electron Dose ◽  
Dose Rates ◽  
First Case ◽  
Diffraction Patterns ◽  
The Many

Diffraction studies in polymeric and other beam sensitive materials may bring to mind the many experiments where diffracted intensity has been used as a measure of the electron dose required to destroy fine structure in the TEM. But this paper is concerned with a range of cases where the diffraction pattern itself contains the important information.In the first case, electron diffraction from paraffins, degraded polyethylene and polyethylene single crystals, all the samples are highly ordered, and their crystallographic structure is well known. The diffraction patterns fade on irradiation and may also change considerably in a-spacing, increasing the unit cell volume on irradiation. The effect is large and continuous far C94H190 paraffin and for PE, while for shorter chains to C 28H58 the change is less, levelling off at high dose, Fig.l. It is also found that the change in a-spacing increases at higher dose rates and at higher irradiation temperatures.

Contaminated land audits-practical aspects

1993 ◽  
Vol 1 (1) ◽  
pp. 22-26 ◽  
Author(s):  
John Dennis
Keyword(s):  
Contaminated Land

Transformation of evaluation criteria of lands withdrawn from agricultural turnover due to radioactive contamination

2020 ◽  
pp. 23-27
Author(s):  
Olga Merzlova
Keyword(s):  
Economic Evaluation ◽  
Radioactive Contamination ◽  
Chernobyl Accident ◽  
Evaluation Criteria ◽  
Contaminated Land ◽  
Degradation Processes ◽  
Agricultural Use ◽  
Land Clearance

One of the measures to eliminate the consequences of the Chernobyl accident was the exclusion of highly contaminated land from agricultural use. Due to the positive dynamics of the radiation situation, the issue of land return becomes relevant. However, in the period of exclusion of these lands the land clearance degradation processes were developing. The second part of the article is devoted to the issue of economic evaluation of the expediency of land return and the mutual coordination of the results of separate stages of complex ecological and economic evaluation. The research was carried out in Mogilev branch Institute of radiology (Republic of Belarus).

Transformation of assessment criteria for lands withdrawn from agricultural use due to radioactive contamination

2020 ◽  
Vol 0 (6) ◽  
pp. 24-30
Author(s):  
Olga Merzlova
Keyword(s):  
Economic Evaluation ◽  
Radioactive Contamination ◽  
Chernobyl Accident ◽  
Assessment Criteria ◽  
Contaminated Land ◽  
Criteria And Indicators ◽  
Agricultural Use ◽  
Natural Decay

One of the measures to eliminate the consequences of the Chernobyl accident was the exclusion of highly contaminated land from agricultural use. During the natural decay of radionuclides there is a decrease in the activity of 137Cs and 90Sr in the soil. The issue of land return becomes relevant. The article describes the main stages of formation of the system of criteria and indicators of ecological and economic evaluation of the expediency of land return. The first part of the article is devoted to the issue of radiological evalation.

IMITATION OF THE ADRENO-CORTICAL RESPONSE TO SURGERY BY INTRAVENOUS INFUSION OF SYNTHETIC HUMAN ACTH

1973 ◽  
Vol 72 (1) ◽  
pp. 75-80
Author(s):  
Henrik Kehlet ◽  
Christian Binder ◽  
Christen Engbæk
Keyword(s):  
Intravenous Infusion ◽  
Time Course ◽  
Cortical Response ◽  
Secretion Rate ◽  
Major Surgery ◽  
Acth Secretion ◽  
Dose Rates

ABSTRACT The concentration of plasma corticosteroids was followed during major surgery and during the infusion of synthetic human ACTH at dose rates varying from 2400 ng to 15 000 ng per hour. The results showed that the time course of plasma corticosteroids during major surgery was intermediate between that obtained during the infusion of 7500 and 15 000 ng synthetic human ACTH per hour. This gives an estimated ACTH secretion rate during major surgery of between 7500 ng and 15 000 ng per hour.

Risk-based land management - a concept for the sustainable management of contaminated land

2003 ◽  
Vol 11 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Joop Vegter ◽  
Judith Lowe ◽  
Harald Kasamas
Keyword(s):  
Land Management ◽  
Sustainable Management ◽  
Contaminated Land
Sign in / Sign up

Export Citation Format

Share Document