Yes, nosebleeds do tend to occur more often during pregnancy. Pregnancy can cause the blood vessels in your nose to expand, and your increased blood supply puts more pressure on those delicate vessels, causing them to rupture more easily. Although it's unpleasant and inconvenient, an occasional minor nosebleed is generally harmless.
The higher the energy of the gamma rays, the thicker the shielding made from the same shielding material is required. Materials for shielding gamma rays are typically measured by the thickness required to reduce the intensity of the gamma rays by one half (the half value layer or HVL).
1 Gamma radiation and x rays are electromagnetic radiation like visible light, radiowaves, and ultraviolet light. 2  These electromagnetic radiations differ only in the amount of energy they have. 3  Gamma rays and x rays are the most energetic of these. Beta radiation may travel several feet in air and is moderately penetrating. 2  Beta radiation can penetrate human skin to the germinal layer, where new skin cells are produced. 3  If high levels of beta-emitting contaminants are allowed to remain on the skin for a prolonged period of time, they may cause skin injury.