English 140

Assignment 4

Reproduced by permission of My Tai Sparling

Radiographic film and photographic film processing are similar in many respects such as developing, rinsing, fixing time, washing and drying. In manual processing, the first condition that is of particular importance in developing film is the temperature of the developing solution and the amount of time the reaction is allowed to continue. Optimum developing time and temperature for manual processing is four and a half to five minutes at 20oC. In addition, the longer film is developed the darker and less visible it becomes. The same result can also be produced if the temperature is increased. After being developed, the film should be rinsed in clean, circulating water for thirty seconds. Then the fixing time for manual processing should be at least ten minutes. However, if film has to be viewed right away, it may be read in white light after being developed for five minutes more. After the film has been fully fixed, it must be washed and dried. Moreover, films should be washed in a separate compartment in clean, running water. Wash time should be no less than twenty minutes. After a complete wash, the film is dried and ready to put into the patient's file.

Note: This assignment shows good use of the required target grammar—passive constructions—and the fact that the student used, and identified, more than the minimum required constructions.