## Glossary of RadTech: Physics - Ch .2

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- What is a Fraction?
- The numerical expression obtained by deviding one number into another.

- What are the three parts to a fraction?
- 1. The numerator.

2. The denominator.

3. The Quotient.

- What is the S.I. System?

What is another name for it? - System Internationale.

The Metric or MKS system.

- Give four ways to represent numbers.
- 1. fractional.

2. Decimal.

3. Exponentional.

4. Logarithmic

- What is the decimal system?
- Numbers grouped in multiples of ten.

- What is the Exponential system?

What is another name for it? - A decimal number multiplied by 10 to an Nth power.

Scientific Notation.

- What is the Logarithmic system?
- Numbers expressed as xponents of 10.

- What characteristic does a logarithmic scale have?
- It is non-linear and allows large ranges of values to be plotted.

- What is a linear scale?
- Equals lengths on the scale have equal value.

- What is an Ordered Pair?
- The two co-ordinates of a point such that it can be plotted on an X-Y graph.

- What is a ratio?
- The relation in degree or number between two similar things.

- What is a proportion?
- A statement of equality between two ratios. Four quantities, a, b, c, d, are said to be in proportion if a/b = c/d.

- What is the Symbol and Exponent for:

deka

hecto

kilo - 1. da 1

2. h 2

3. k 3

- What is the Symbol and Exponent for:

mega

giga

tera - 1. M 6

2. G 9

3. T 12

- What is the Symbol and Exponent for:

deci

centi

milli - 1. d -1

2. c -2

3. m -3

- What is the Symbol and Exponent for:

micro

nao

pico - 1. u -6

2. n -9

3. p -12

- What are the four Radiological units?

What are their symbols? - 1. The Roentgen. R

2. The Rad rad

3. The Rem rem

4. The curie Ci

- Give the SI unit names and symbol for:

1. The Roentgen.

2. The Rad

3. The Rem

4. The curie - 1. air kerma Gya

(grey in air)

2. grey Gyt

(in tissue)

3. sievert Sv

4. becquerel Bq

- What is a Roentgen?
- The radiation intensity that will create 2.08 x 10⁸ ion pairs in 1 cc of air.

- What is a second way to define a Roentgen?
- 2.58 x 10⁻⁴ C/kg

coulombs of charge per kilogram of air

- What is a Rad?
- 100 ergs per gram.

- What is a Curie?
- The quantity of radioactivity in which 3.7 x 10(10) nuclei disintegrate every second.

- What is the relationship between

Roentgens and air kerma? - R x .01 = Gya

- What is the relationship between

rad and grey? - rad x .01 = Gyt

- What is the relationship between

rem and sievert? - rem x .01 = Sv

- What is the relationship between

curie and becquerel - Ci x 3.7 x 10(10) = Bq

- How do you determine the number of Significant Figures of a number?
- 1. Add all the non-zero numbers

2. then add all the zeroes between the non-zero numbers

3. then add all the zeroes at he beginning of the number.

- What is the rule to convert larger decimal quantities to smaller?
- Move the point to the left.

- What is the rule to convert smaller decimal quantities to larger?
- move the decimal point to the right.