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§ 20 § 20 Röntgenverordnung (röv_1987) [§ 20 X-ray Ordinance] (in German) and § Annex+2 Annex 2 (to § 8 para. 1 sentence 1 RöV) (röv_1987) (in German) Depending on the application, nuclear medicine requires even more extensive protective measures, up to and including concrete walls several meters thick.
Cost of electricity by source. Different methods of electricity generation can incur a variety of different costs, which can be divided into three general categories: 1) wholesale costs, or all costs paid by utilities associated with acquiring and distributing electricity to consumers, 2) retail costs paid by consumers, and 3) external costs ...
On April 20, 2016, Treasury Secretary Jacob Lew announced that the $5, $10, and $20 would all undergo redesign prior to 2020. The changes would add new features to combat counterfeiting and make them easier for blind citizens to distinguish.
This is a list of megaprojects, which may be defined as: Projects that cost more than US$1 billion and attract a large amount of public attention because of substantial impacts on communities, the natural and built environment, and budgets. Projects with "initiatives that are physical, very expensive, and public".
One-dollar banknotes were discontinued and gradually replaced with an aluminium-bronze coin. The 5-cent coin was also changed to aluminum-bronze while the 10, 20, and 50 cents remained copper-nickel. Limited numbers of commemorative bimetallic 5-dollar coins with scalloped edges were also periodically issued later during this series.
Acetone is a main ingredient in many nail polish removers because it breaks down nail polish. [75] It is used for all types of nail removal, like gel nail polish, dip powder and acrylic nails. [76] Acetone is often used for vapor polishing of printing artifacts on 3D-printed models printed with ABS plastic.