Page 303 - Radiation Safety

PROTECTION AGAINST EXTERNAL HAZARDS

(SHIELDING)

▪ Half Valued Layer(HVL)

Thickness needed to reduce the intensity of radiation to half of

the initial intensity.

▪ Tenth Valued Layer(TVL)

Thickness needed to reduce the intensity of radiation to one

per ten of the initial intensity.

Equation:

1. HVL = 0.693/

2. n = x / HVL or n = x / TVL

n
3. I / I = 2 or I / I = 10 n
n
o
o
n