Question

Distinguish between the following:

Remote sensing in the Gamma Ray Region and Ultraviolet Region.

Answer 1

Sr. No.	Aspect	Gamma Ray Region	Ultraviolet (UV) Region
1.	Wavelength Range	Extremely short wavelengths: < 0.03 nm.	Wavelengths from 0.01 µm (10 nm) to 0.4 µm (400 nm).
2.	Penetration Ability	Highly penetrating, can pass through solid materials.	Limited penetration; interacts mainly with surface features.
3.	Source of Energy	Emitted from natural radioactive materials (e.g., minerals, rocks).	Comes mainly from the sun (solar UV radiation).
4.	Remote Sensing Applications	Used to detect radioactive elements or isotopes in Earth’s crust.	Used to study atmospheric properties (e.g., ozone), fluorescence in vegetation, and shallow water quality.
5.	Atmospheric Absorption	Gamma rays are mostly absorbed by the atmosphere; measurements are usually made near or on the ground.	Short-wave UV (< 0.3 µm) is absorbed by ozone; longer-wave UV can reach Earth’s surface.
6.	Commonly Used	Geological surveys, mineral exploration, radioactive mapping.	Vegetation studies, water quality analysis, and ozone layer monitoring.