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  2. Coupon (finance) - Wikipedia

    en.wikipedia.org/wiki/Coupon_(finance)

    Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. For example, if a bond has a face value of $1,000 and a coupon rate of 5%, then it pays total coupons of $50 per year.

  3. Gray (unit) - Wikipedia

    en.wikipedia.org/wiki/Gray_(unit)

    LD 1 is 2.5 Gy, LD 50 is 5 Gy and LD 99 is 8 Gy. The LD 50 dose represents 375 joules for a 75 kg adult. Absorbed dose in matter. The gray is used to measure absorbed dose rates in non-tissue materials for processes such as radiation hardening, food irradiation and electron irradiation. Measuring and controlling the value of absorbed dose is ...

  4. Radiation - Wikipedia

    en.wikipedia.org/wiki/Radiation

    In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. [1] [2] This includes: electromagnetic radiation consists of photons, such as radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation (γ) particle radiation consists of ...