HW RTE 3

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Community College of Denver *

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101

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Chemistry

Date

Feb 20, 2024

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docx

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Uploaded by CoachMusicDeer26

1. Compare kVp with mAs in their respective roles in x-ray production. mAs determine the flow of electrons for a certain length of time, which is normally measured in thousandths of a second. While kVp determines the force behind the flow of electrons and determines the penetrating ability of the radiation, it affects the energy of the radiation that will go into the tissues and through the patient which will then strike the image receptor. 2. Describe the required alignment of x-ray tube, anatomical part and image receptor in creating a nondistorted image. The required alignment of the anatomical part should be placed as near to the receptor as possible in order for the sharpness of the image to be improved, if not the edges of the image will be seen as indistinct. The required alignment of the image receptor is referred to when using the longest and most practical source to image receptor distance and the lowest practical object to image receptor distance in order to obtain the highest resolution. Lastly the required alignment of the x-ray tube is for it to be in parallel planes with the part and image receptor in order for there to be no shape distortion in the x-ray. 3. Discuss the importance of external and internal patient preparation, including it's role in radiation protection. External preparation requires removing clothing and jewelry that may be covering the area of the boy which the x-ray passes through. This is because clothing can show up on the image and obstruct shadows and buttons and zippers can hide small disease processes or fractures. Dentures must be removed if necessary because they can interfere with the passage of the x- rays, as well as rings and watches. All jewelry must be removed before the examination if necessary, and failing to do so causes a double dose of radiation to the patient because the radiographs must be retaken. As well tattoos, some ink may contain metallic pigmentation and can appear as a faint shadow on the image. Proper examination of the patient and checking for unwanted objects in a verbal, visual, and tactile manner is the responsibility of the radiographer and vital before the exam. In internal preparation this includes preparations that are administered on the nursing units or by the patient at home. Such as cleansing enemas, so structures in the abdomen are not obstructed by gas and fecal materials or having the patient take nothing by moist for several hours before the procedure. Spreading the awareness of the procedures helps explain the importance of this preparation and allows the radiographer to answer questions the patient might have. Radiographers must be aware of all aspects of patient care that relate to the examination before and after, regardless of who performs them. 4. Discuss the primary advantage of using fluoroscopy. The primary advantage of using fluoroscopy is it provides a live action view of the interior of the body which is necessary for proper diagnosis. It also allows the radiologist to capture an image and make a permanent record of it which can be saved in a computer and postprocessed in many different ways.

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A 0.1860 g rock sample containing an unknown amount of Ca was dissolved in HCI and diluted to 100.0 mL. Aliquots of 5.00 mL from this solution were added to different volumes of a 2.08 µg/mL. Ca standard solution and diluted to 200.0 mL. The emission intensity of these solutions was measured using atomic emission spectroscopy. The results are shown in the table. Unknown volume (mL) Standard volume (mL) Final volume (mL) Emission Intensity 0.00 200.0 5.00 200.0 10.00 200.0 15.00 200.0 20.00 200.0 Find the weight percent of Ca in the rock sample and its uncertainty using the method of standard additions. weight percent: 5.00 5.00 5.00 5.00 5.00 8.27 x10-5 Incorrect % Ca .03 Incorrect 227.0 413.0 637.0 831.01 1021.0

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