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If you engage in anal sex, it is always important to use a condom to protect against the spread of infections and diseases.Radiation is an extraordinarily versatile and useful tool in medicine, industry, and research.We will briefly introduce some basic radiation safety concepts and principles as they apply to the use of portable nuclear gauges.While the human body can sense and take actions to prevent injury by many physical agents, such as heat and noise, it cannot sense radiation.For purposes of radiation safety, only radiation with the capability to cause ionization is of concern.

Since they cannot penetrate even the outer dead layer of our skin, they are not an external hazard.X-rays are the same as gamma rays, except they originate outside the nucleus from processes involving electrons.Other familiar types of electromagnetic wave radiation include: visible light, ultraviolet light, infrared light, microwaves, and radiowaves.In 1898, Pierre and Marie Curie isolated the first radioactive elements, radium-226 and polonium-210.The momentous discoveries of these physicists led to a rapid advancement of scientific knowledge about radiation and radioactivity, as well as to many practical uses.For heterosexual couples, pregnancy can occur if semen is deposited near the opening to the vagina.