How does a lightening rod work?
Locked Up mean the engine is seized, probably due to running with no oil or major overheating. It will probably need replaced.
Depends on what field they go into. Most radiation exposure can be limited by time distance and shielding. If you are strictly working around x-rays the it is easy to avoid exposure. If you are working around people who have been made radioactive it is a lot harder to avoid said exposure. Typically safety measures include dosimetry to monitor your exposure, and using a limited amount of exposure to the source with whatever shielding is appropriate.
A great deal of effort goes into trying to ensure that radiologists, radiology technicians, nuclear medicine techs, nuclear power plant personnel and anyone else who is around radiation of any kind is well shielded. Radiologists and techs always wear dosimeters on their clothing to get a general measure, month-to-month, of their exposure. Usually, when an x-ray is taken, everyone except the patient steps out of the room, or behind a lead shield during the moment needed for the exposure. If anyone needs to remain in the room by the patient, then they wear an apron that covers them from over the shoulders to below the knee. It is filled with a sort of plastisized layers of lead so it is flexible. If anyone needs to have their hands near the x-ray field, if they are manipulating a catheter for instance, then they may wear lead gloves, and they would always have a ring-dosimeter on a finger. The patients may also be draped with a lead apron to protect areas of their body that are not being x-rayed from any scatter. The dosimeters worn on clothing are collected once a month and the amount of exposure is determined. If someone has been exposed to a more than the expected amount of radiation, they may be asked about what kinds of medical procedures they did and what safety procedures they followed to find out if there is a problem with the protection protocols. It is also possible that someone could be restricted from doing certain things for some period of time to reduce the overall exposure. When sufficient shielding is impractical or impossible, the only other options are to minimize the time spent in the area of exposure, and to maximize the distance between the person and the radiation source. There are guidelines for maximum exposure times for any particular level and type of radiation. The medical community is well aware of the danger from long term radiation exposure and tries to minimize it for both patients and staff.
