| 单词 | half-thickness |
| 释义 | > as lemmashalf-thickness half-thickness n. Physics the thickness of a specified material which reduces the intensity of incident ionizing radiation by half; = half-value thickness n. at half-value n. ΘΠ the world > space > extension in space > measurable spatial extent > thickness > [noun] > thickness of material that halves radiation half-value thickness1938 ?c1946 G. T. Seaborg et al. Introd. Nucl. Chem. Lect. Series 1942 (U.S. Atomic Energy Comm.) vii. 41 (caption) Half-thickness values for γ rays and X rays. 1958 W. K. Mansfield Elem. Nucl. Physics v. 45 To compare the penetrating power of the γ-rays with that of α and β-rays, it is necessary to estimate the half-thickness. 2007 European Jrnl. Soil Sci. 58 344/1 The half thickness (i.e. the thickness of absorbing material that will reduce the radiation to half its value) of dry soil with a bulk density of 1.6 Mg m–3 is 10 cm. half-thickness half-thickness n. Physics = half-value n. thickness. ΚΠ 1950 S. Glasstone Sourcebk. Atomic Energy vii. 170/2 The mass half-thickness, i.e., the actual..half-thickness multiplied by the density, is almost independent of the material absorbing the gamma rays. 1958 W. K. Mansfield Elem. Nucl. Physics v. 45 To compare the penetrating power of the γ-rays with that of α and β-rays, it is necessary to estimate the half-thickness. 1960 J. N. Gregory World of Radioisotopes i. 9 The shorter the wavelength of the γ-radiation the greater the half-thickness. < as lemmas |
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