Background radiation

1 Introduction Interferometry is a measurement technique which utilizes the interference of waves in a medium to cre-ate interference patterns [5]. In general, the waves can be light, sound or radio waves. The interference pattern is detected by a photodetector and it provides some useful information about the properties of the object or phenomenon under test. Interferometers are used to make very small measurements that cannot be achieved with any other method. An important…

Visual acuity Main article: Visual acuity Visual acuity is the eye's ability to detect fine details and is the quantitative measure of the eye's ability to see an in-focus image at a certain distance. The standard definition of normal visual acuity (20/20 or 6/6 vision) is the ability to resolve a spatial pattern separated by a visual angle of one minute of arc. The terms 20/20 and 6/6 are derived from standardized sized objects that can be seen by a "person of normal vision" at the specified…

Authors Delfino and Day explain the risks to radiation exposure. “ [Eric J.] Hall and [Li-Jun] Wu of the Columbia University College of Physicians and Surgeons and others point out that the very nature of IMRT necessitates a longer radiation time, a larger volume of non-malignant tissue exposed to radiation, and an increase in total exposure—all of which nearly double the risk of radiation-induced secondary cancers with post-exposure lifetime....”(3). This shows how…

Knowing how it works, and what your going to expect calms most peoples fears. Chemotherapy gives the patients a feeling of control over their Cancer. Radiation therapy is using high-energy particles to destroy or damage the Cancer cells. Radiation therapy is the most common Cancer treatment. It can be used by itself to with other treatment types. Hyperthermia is using heat to treat the Cancer. This method has been used for a long time but never…

Introduction Thermodynamics is an essential concept examined during the construction stage of houses, especially in the countries reaching extreme temperatures, such as Australia. By understanding the physics involved in thermodynamics throughout the construction stage of houses, such as heat transfer involving different colours and thicknesses, it is possible to re-examine the insulation of houses in hot countries. Such a report can lead to finding the most appropriate colour and thickness for…

Since ancient Greece, humanity has become fascinated with science. The development of new technologies that will further the existence of mankind, has been the goal for many great scientists. Through centuries of experimenting, the mid-evil era of alchemy, and many years after, Chemistry became a topic of much importance. During the 1800’s, science had become one of the most rapidly growing fields as explanations for how things work, or the technological progression allowing us to discover more.…

• Radiation therapy: (in stage II, III &IV) Radiation therapy destroys cancer cells. It is used when colon cancer has attached to an internal organ so the surgeon cannot be sure if all the cancer has been removed or not for that, radiation therapy will be used to kill the cancer cells that haven’t been removed. In addition, it will be used to treat colon cancer if it metastasized. Radiation therapy helps in preventing cancer recurrence. Also it’s used before the surgery to shrink the tumor. They…

1.0 INTRODUCTION It is known that radiation can be very harmful to a person’s health. According to Marshall and Keene (2006:1), with the recent expansion of diagnostic and interventional radiology, it has been noted that an alarming dose of radiation can be administered to a patient, in a single scan, without having to repeat a procedure. With the evolution of radiography, interventional radiology has become a norm in the diagnosis protocol and it is therefore important to understand the concept…

A mass is a lump that either your caregiver found during an examination or you found before seeing your caregiver. The colon is a major part of the large intestine. There are many possible reasons why a lump has appeared. Testing will help determine the cause and the steps to a solution. CAUSES Before complete testing is done, it may be difficult or impossible for your caregiver to know if the lump is truly in the colon or comes from one of the organs that are next to the colon. Problems in…

The symptoms of multiple myeloma consist of pain from a pinched nerve or a collapsed vertebrae, anemia and fatigue associated with anemia, hypercalcemia (too much calcium in the blood) and blood clots. Multiple myeloma can cause the patient to have a weakened immune system depending on the stage of the cancer. This then causes additional complications related to a feeble immune system such as fever, weight loss, thirst, infections, bleeding gums, mental confusion and kidney failure. Usually the…