Roentgen, definition

Roentgen, definition of the, 248 Roentgen, W. C., discovery and investigation of x-rays by, 2, 9-12, 43 Nobel Prize awarded to, 2 production of secondary x-rays by, 12 x-ray absorption studies by, 11 x-ray papers of, 2... 

As regards the production of alkaloid derivatives of lysergic acid, the present invention is not limited to the use of the described strains, but comprises also the mutants thereof, which may be obtained, e.g., by means of either a selection or a mutation by the action of U.V. rays or Roentgen rays or any other mutagenous substance or, particularly, by artificial infection of either embryos or grasses cultivated in vitro or plants of grasses cultivated both in vivo or in vitro and the said mutants are to be included in the definition of a new strain of Claviceps paspali Stevens and Hall. 

The measurement of exposure is achieved by using ionization chambers, and the result is given in roentgens. Based on the definitions of the roentgen, the following relationship can be established between roentgens and rads. 

Roentgen - Is a imit of exposure. It is defined as the quantity of X or y radiation such that the associated corpuscular emission per 0.001293 gram of dry air (at normal conditions) produces in air ions carrying 1 esu of electric charge of either sign. This definition requires that all electrons liberated by the photons in a mass element of air and all the ions produced by these electrons are stopped in the air. 

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