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The dominant decay mode for the positron emission here is a third forbidden Delta-J = 4 transition , with a change of parity . Some fungi can decay sound wood , others decay only decaying wood and bark . Now , if one is the sort who is happy with that kind of explanation , then why should one bother vomiting forth a totally botched article on the fascinating and complex physics of exotic nuclear beta decays , in an effort to make this religious point ? The conclusion would appear to be that fully stripped , isolated Potassium 40 hardly ever decays to Argon 40 at all . The decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth war is much worse . In both cases the decay resulted from people merely compromising with their environment in honest attempts to find some meaning to their lives . The Forum needs a new guideline ( or the renewal of the existing ) because it has decayed to the point it does n't remind anything previous 9/11 . In fact , the radioactivity of nuclear wastes naturally decays progressively and has a FINITE radiotoxic lifetime . By the middle of the 19th century the area was a slum of narrow alleways and courts , into which about one million people were crowded , the vast majority in single poorly-furnished rooms in decaying houses and tenements , which had neither adequate water supplies nor proper sewage facilities . The loss of these fish and their decaying carcasses at the end of their spawning cycle has had a ripple effect throughout the ecosystem , robbing headwater streams and forests of a valuable source of nutrients . This is because nearly all of the short half-life fission products from the chain reaction will have decayed to negligible levels . When radium in the soil decays the radon produced can rise up into the air and possibly get into a building and concentrate . Trees with sound outer wood shells may be relatively safe , but this depends upon the ratio of sound to decayed wood , and other defects that might be present . The cloak-and-dagger operation began when workers repairing the crypt 's lock noticed the remains were badly decayed ( hardly surprising since Goethe was buried in 1832 ) . Radium 224 decays quickly , and , therefore , only those analyses which are conducted soon after collection will include the contribution from radium 224 . LLW and ILW may be further subdivided into catagories according to the half-lives of the radionuclides they contain , with " short-lived " waste decaying in less than 30 years and " long-lived " taking more than 30 years to decay . If the decay of V is Gaussian or faster , this behaviour is non-classical in the sense that it is not described by the quasi-classical formulas known for the case where V admits a power-like decay . They said the biggest single concern of urban decay is the decline in the American family .