Page 194 - Pharmaceutics IV (02-06-01305)

Table 1: Characteristic features of different types of radiation
emitted by radioisotopes.

________________________________________________________

Property alpha rays Beta rays Gamma rays

______________________________________________ _______

Composition Identical to Electrons or High-
energy

Nucleus of He-4 positron

photons

( 4He ) 2proton &2

Neutron

Charge Positive (2+) Negative (1-) None

Electron or (1+)

Positron

Mass Four Zero Zero

Penetration Least Medium
Highest

Depth

Principle High energy Medium Highest
tracer&

Application bombardment radiotherapy diagnostic

r radioimminotherapy

4