Space missions in the radiation properties and ris -

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Space missions in the radiation properties and risk assessment

The beginning of a passage of 300 years as we have made unremitting efforts to the relationship between the radiation biology (for example,[link widoczny dla zalogowanych], RBE) with the relationship between physics (such as LET or linear energy transfer energy on the line) linked together, \alone counts for some simple inference is childish, and its conclusions are not reliable, very easy to fall into A. - kind of paradoxical situation. which often rely on very few facts or hand some of the little data to determine However, the discovery and proof of science and technology used in the inference must be more than adequate to analyze the reflection and exclusive nature of suspicious characteristics, however, in order to study their own appropriate Tuidao table shows that there are lots of unexpected little things to be used as this. have to pay far more than labor ... ... \The relative biological effects induced cancer adverse factors: the relative biological effects with the drug dose, baseline radiation dose rate, particle level and relies on linear energy (LET) is inversely proportional to change. And also as the organization may be. The quality of the random coefficient on low-dose should be used to teach the original circumference is the relative biological effectiveness of these features make property factor is very high at low doses, but not 24 ● ∞ ∞ big barrier which is attributed to the effects of radiation reduced the benchmark it. Ji means to evaluate effects of various types of radiation, a special risk of radiation directly to the independent risk assessment. Perhaps in the future, we no longer have to rely on the relative biological indirectly then, we can with the vagaries of the radiation phase in the benchmark report in 1969 it was recognized that the importance of the maximum relative biological effectiveness (Figure l can be seen), because the reference radiation (x or 7-ray response curve. relative biological effectiveness increases with the dose reduced until the high and low linear energy transfer radiation showed a linear change again until the cancer dose response curve of the first slope was selected as the maximum value of relative biological effectiveness (RBEm). and the quality factor Q should be selected or weighted coefficient w value using RBE. In this method is still not widely used before,[link widoczny dla zalogowanych], there may be a very long time, Because low enough doses, and do not have enough data. has been proved that the determination of the initial slope of the high costs,[link widoczny dla zalogowanych], long time. And there is no such suitable range of tissues and organs of the slope. so on the basis of established RBEm election Q or w value is still rough and simple, Table 2 reveals the different forms of radiation absorbed dose to compare the accumulation of carcinogenic effects. its complexity is obvious. on the heavy ions. One question is whether the dose should be taught as quantitative basis for comparison. Curitis, who also discussed the amount with a note instead of the possibility of dose, l963 RBE members in Taiwan pointed out that insufficient data to use,[link widoczny dla zalogowanych], especially for low dose,[link widoczny dla zalogowanych], low dose rate without considering the radiation properties encountered to the difficulties. You left is that these defects are still not completely ruled out. Sinclair reviewed the available data, ICRU also lists the available neutron data As RBEm HZE particles, our knowledge on the human body can be applied to data less. Han of little exposure to fission neutrons in the assessment of organs were RBEm Results (Table 2). Assessment of heavy particle stripping less (Table 3). Table: swelling in mice, the maximum relative biological effects of blast (RBEm) type organization heavy ion LET (keV / ~ m) RBE If I ff] {I continue to use the maximum operator to study the biological effects of radiation in the air with the Q factor, then the existence of three issues. (1) does not indispensable less available RBEm (2) the usefulness of using RBEm should be able to guarantee these rates extrapolated across species; (3) in the space radiation environment in any particular how to derive a single Q value. that officers of different devices 2j RBEm how to balance. Use RBEm of an alternative is: to determine by experiment within the scope of a typical cancer risk per unit dose, and extrapolation to humans. Although no generally accepted method for the extrapolation, but some of the people in the future extrapolation methods approved will be feasible. with a heavy particle induced cancer risk assessment, some methods are based on the basis of the fluence, attractive, according to reports. Crut [s done a study on this topic. 26il more dropped out (LLR) the amount of radiation 2060100400600 Jing (radcGy) high-LET radiation around I RBEmIcGyIcGy1 particles IMeV7 RBE and neutron radiation IMeV Fe (z = 26) ~ 4 tracks / cell ~ I track / cell number of cells / Track Circuit 2 rays, fission neutrons, and the difference between accumulation of Fe dose Mengjin Song translated AdvSpaceRes.12 (2 ~ 3) :403 - 406 (in hi Sea School)

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