WebOct 30, 2010 · Cobalt-60 has a half-life of 5.26 year. The cobalt-60 in a radiotherapy unity must be replaced when its radioactivity falls to 75 percent of the original sample. If the original sample was purchased in November of 1996, when will it be necessary to replace the cobalt-60? Homework Equations ln ( No / Nt ) = kt t 1/2 = .693 / k The Attempt at a ... WebAug 18, 2004 · Cobalt-60 (Co-60) Beta particles: electrons ejected from the nucleus of a decaying atom. Although they can be stopped by a thin sheet of aluminum, beta particles can penetrate the dead skin layer, potentially causing burns. They can pose a serious direct or external radiation threat and can be lethal depending on the amount received. They
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WebWhat is the half-life of cobalt -60? 110g of cobalt - 60 decayed into 6g after 22 years. What is the half-life of cobalt -60? Expert Answer. Who are the experts? Experts are tested by Chegg as specialists in their subject area. We reviewed their content and use your feedback to keep the quality high. WebJul 3, 2016 · The half-life of cobalt-60 is 5.26 years. If 50 g are left after 15.8 years, how many grams were in the original sample? Chemistry Nuclear Chemistry Nuclear Half-Life Calculations. 1 Answer Sam Jul 3, 2016 #m_i= 400 \ grams# Explanation: The following formula relates the mass remaining of the radioiosotope to the original mass: ... curried ground beef with peas and potatoes
The half life of cobalt 60 is 5.25 yrs. After how long does its ...
WebThe half-life of cobalt-60 is 5.26 years. If 50 g are left after 15.8 years, how many grams were in the original sample? The half-life of radon-222 is 3.8 days. WebCo-60 has a biological half life of 9.5f days, and an effective half life of 9.5 days. The maximum permissible body burden (MPBB) is 1.0 uCi, based on Stanford Guideline of whole body dose not exceeding 500 mRem/yr. The Annual Limit of Intake (ALI) is 54 uCi. DOSIMETRY AND BIOASSAY REQUIREMENTS: WebAug 8, 2024 · Thus, a cobalt-60 source that is used for cancer treatment must be replaced regularly to continue to be effective. Figure 11.5.1: For cobalt-60, which has a half-life of 5.27 years, 50% remains after 5.27 years (one half-life), 25% remains after 10.54 years (two half-lives), 12.5% remains after 15.81 years (three half-lives), and so on. charter flooring