| 释义 |
radioˈchemical, a. (n.)
Also with hyphen.
[f. radio- 3 + chemical a.]
1. Of, pertaining to, or considered in terms of radiochemistry; radiochemical purity, the state of being free from radioactive impurities. Also as n., a radioactive chemical.
1915F. Soddy Chem. Radio-Elements (ed. 2) i. 46 In a condition of complete radio-chemical purity. 1946Chem. & Engin. News 10 Dec. 3168/1 Laboratory facilities for radio⁓chemical research are classified according to the level of radioactivity involved in the operations. 1961G. R. Choppin Exper. Nucl. Chem. ix. 129 Radiochemical purity is frequently of greater importance than chemical purity; it may be better to have a milligram of inert impurity in the final sample than 10-9 gm of radioactive contaminant. 1971New Scientist 1 Apr. 26/2 The US market is estimated to be worth over $80 million a year with some $25 million spent on radiochemicals, $40 on radiopharmaceuticals, and about $20 million on basic radioisotopes and sealed sources. 1973D. L. Horrocks in Moghissi & Carter Tritium i. 34 The total fissions are determined by radiochemical assay of a fission product (i.e., 140Ba) of known yield. 1978Nature 11 May p. xii/1 (Advt.), Our supply of radiochemicals of the highest quality and technical specifications.
2. (With hyphen.) Of or pertaining to chemical changes caused by radiant energy. rare.
1921D. H. Lawrence Let. 2 Mar. (1962) II. 512 The sun is dangerous these months—it has a radio-chemical action on the blood which simply does for me. 1935Mind XLIV. 545 In general, chemical reactions are coming to be conceived in the light of the ‘radio-chemical’ hypothesis, viz. that no structural modification can take place except as the result of quantities of radiant energy imparted in rhythmic pulses.
Hence (sense 1) radioˈchemically adv., by a radiochemical method or process; in terms of radiochemistry.
1915F. Soddy Chem. Radio-Elements (ed. 2) i. 44 Another and very important sense [of the term ‘pure’], which may conveniently be termed ‘radio-chemically’ pure. 1923Glazebrook Dict. Appl. Physics IV. 590/1 A product may be prepared ‘radio-chemically’ pure, in which the radio⁓element may be mixed with a certain amount of inactive matter, but is free from substances chemically analogous to itself. 1957Jrnl. Biol. Chem. CCXXIX. 443 A substance subsequently shown to be radiochemically pure was treated in a similar manner. 1975Nature 1 May 77/1 The plutonium in each right testis was measured radiochemically. |