Nuclear density gauge is a device use for testing various parameters such as wet density, dry density, and moisture in constructions, petroleum and other industries with the help of radioactive sources. The radiation source emits particles which are received by the detector after reflecting from the test material. These received particles are measured by the sensor and this data is used by the gauge to calculate the nuclear density of the test material. The report concentrates on the different types of radiations used in nuclear gauge depending on the application. These include the neutron, beta, and gamma radiations. Neutron radiations are majorly used for measuring the moisture in soil and asphalt. These radiation scatter by material with high hydrogen content and have high penetrating power. Neutron sources such as Americium or Beryllium are used to check the performance of Separators (Oil Production). Similar to neutron radiations, gamma are also has high penetrating power and are ...