PCFC-Entity (Business Unit) Name: Trakhees-Ports, Customs & Free Zone Corporation
Department Name: Civil Engineering Department (CED)
Section Name: Permits Section (Facilities)
Document Reference Number: PCFC-TRK-CED-PS-REG-26
Revision Number: 01
Revision Date: May 2019
Classification: Public
(lonizing radiation spreads through space like light or heat. Generally, the farther you are from a source of radiation the lower your dose rate. Distance is very useful for protection when handling physically small sources. The dose rate from a small source is inversely proportional to the square of the distance from the source. This "inverse square law" means, for example, that if the distance from the source is doubled, the dose rate will be one fourth. If you get too close to a source, the dose rate can increase substantially. The dose rate at 0.1 inch from a small source will be 10,000 times higher than 10 inches from the source. lonizing radiation imparts energy to living cells. In large enough doses, this energy can damage cellu...