There are 3 primary types of radiation:
Alpha – these are rapid relocating helium atoms. They have high energy, commonly in the MeV range, yet because of their large mass, they are dropped in simply a couple of inches of air or a piece of paper.
Beta – these are fast relocating electrons. They normally have powers in the variety of a few hundred keV to numerous MeV. Considering that electrons are may lighter compared to helium atoms, they are able to permeate better, with a number of feet of air, or several millimeters of plastic or less of extremely light steels.
Gamma – these are photons, just like light, except a lot greater energy, usually from a number of keV to a number of MeV. X-rays, as well as gamma rays, are really the exact same point, the difference is exactly how they were produced. Depending on their energy, they can be stopped by a slice of lightweight aluminum foil, or they could pass through several inches of lead.
In this experiment, we research the penetrating power of each kind of radiation. For this test, we utilized an old radium layered watch hand, acquired from, where else, eBay.
The radium is an alpha source, and we likewise obtain numerous beta and also gamma emissions as well from daughter items. This hand has to do with HALF A CENTURY old, so we need to obtain a wonderful combination of radiations. This makes it an excellent resource to utilize for these experiments.
We top to place the radium watch hand concerning 1 cm from the face of a GM-45 detector. We got approximately 44307 CPM. A GM-10 detector would certainly also function, and also costs regarding half as much.
Next off, we positioned a solitary piece of paper between the watch hand and also detector. The rate went down to 35111 CPM. The paper blocked every one of the alpha rays.
We after that put the 2nd notepad in between, the matters dropped to 31583 CPM. With the 3rd piece of paper, 27977 CPM. We are now blocking beta rays with our pieces of paper, each item obstructs some more of the radiation. You can also check out lndinc
With 3 mm of steel (1/8 inch), the analysis dropped to 394 CPM. The background has to do with 50 CPM, so at this point, we’re getting a few of the gammas from the resource.