X-Ray Random Notes

- Atom is the smallest unit of an element.

- Ionization: loss of an electron, thus becoming positively charged.

- Ionization occurs inside the xray tube and inside the body.

- Tungsten is used in xrays, it is given the symbol ‘W’ on the periodical table.

- Speed of light = 186,000 miles/second

- Radioactivity is not involved in xray imaging, once an xray is taken the room is clear.

- Types of ionizing radiation:

1. Particulate (alpha and beta)

2. Electromagnetic (x and gamma ray)

- Electromagnetic radiation is primarily absorbed from the sun:

1. People at high altitude locations absorb approx. 600 milli Roentgens/year.

2. At lower, sea level elevation people will absorb approx. 300 mR/year

- Xray beams yield about 15 mR’s in a given P-A xray.

- ALARA- As Low As Reasonably Achievable: guideline for imaging precaution.

- Particle penetrability comparison:

1. Alpha- Basal cell carcinomas, unable to penetrate a piece of paper.

2. Beta- Can penetrate paper, but not a thin sheet of aluminum.

3. Gamma- Can get through aluminum, but not concrete.

Category: Radiology Notes