| 释义 |
self-ˈshielding, vbl. n. Chiefly Nucl. Physics.
[self- 1 b.]
Shielding of the interior of a body as a result of the outer parts' absorbing radiation coming from the exterior; also = self-absorption 2.
1958Proc. 2nd U.N. Internat. Conf. Peaceful Uses Atomic Energy XIII. 435/1 As the poison becomes depleted, its self-shielding decreases and the poison burns out faster than the fuel, causing a reactivity rise. 1963B. Fozard Instrumentation Nucl. Reactors i. 3 In many practical cases difficulties [in measuring the radioactivity of a source] arise due to such phenomena as self-shielding. 1977J. Moteff in J. Weisman Elem. Nucl. Reactor Design v. 143 The receptor is shielded from each point source not only by interposed shielding material but also by materials within the source itself. This second contribution to the total shielding is called self-shielding or self-absorption.
So self-ˈshielded ppl. a. (quot. 1964 refers to shielding from electromagnetic fields).
1958Proc. 2nd U.N. Internat. Conf. Peaceful Uses Atomic Energy XIII. 433/2 The analytical treatment of self-shielded or lumped poisons. 1964R. F. Ficchi Electr. Interference vii. 119 A self-shielded distributor cap is available commercially that makes use of the same physical configuration as a nonshielded cap. 1973P. F. Zweifel Reactor Physics ix. 248 The center of the resonance line is strongly self-shielded. |