Not plutonium, but iodine-131 !!
The half life of 131I is 8,0197 days.
The Chernobyl fallout primarily consisted of radioactive isotopes like iodine-131, cesium-137, and strontium-90, rather than plutonium. Plutonium was not a significant component of the released radiation.
The isotope 131I is a fission product of uranium and plutonium.
Both iodine-129 and iodine-131 are produced by the fission of uranium atoms during operation of nuclear reactors and by plutonium (or uranium) in the detonation of nuclear weapons. US EPA Link below.
131 millimeters is 5.16 inches.
Iodine-131 and cesium-137 are both radioactive isotopes, but they differ in their properties and uses. Iodine-131 has a relatively short half-life of about 8 days and is primarily used in medical applications, particularly in the treatment of thyroid conditions. In contrast, cesium-137 has a longer half-life of about 30 years and is commonly used in industrial applications, such as in radiation therapy and as a radioactive tracer. Additionally, iodine-131 emits beta and gamma radiation, while cesium-137 mainly emits gamma radiation.
"Bad" types of radiation are the types that hurt you. So there is no really bad types, only bad uses. See the website here for the different types: http://www.hps.org/publicinformation/ate/faqs/radiationtypes.html Then decide for yourself what is a good use and a bad use for the different types of radiation.
The First Part Last has 131 pages.
== You'll find that uranium-235 is the most commonly used radionucliee, and plutonium-239 can be used as well, though the latter is selected as a fuel choice much less often. An extremely distant third is uranium-233. Links can be found below.
about 131 feet
131/60 = 2 and 11/60 hours
2.18 hours.
In radiation therapy, isotopes are often represented by their chemical symbol followed by the mass number. For example, iodine-131 is denoted as I-131, and cobalt-60 is represented as Co-60. This notation indicates the element and the specific isotope used for therapeutic purposes, such as targeting cancer cells.