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Hard X-rays can penetrate solid objects, and their largest use is to take images of the inside of objects in diagnostic radiography and crystallography. The roentgen (R) is an obsolete traditional unit of exposure, which represented the amount of radiation required to create one electrostatic unit of charge of each polarity in one cubic centimeter of dry air. The rad is the (obsolete) corresponding traditional unit, equal to 10 millijoules of energy deposited per kilogram. The sievert (Sv) is the SI unit of equivalent dose, which for X-rays is numerically equal to the gray (Gy).
X-rays are generated by an X-ray tube, a vacuum tube that uses a high voltage to accelerate the electrons released by a hot cathode to a high velocity. In crystallography, a copper target is most common, with cobalt often being used when fluorescence from iron content in the sample might otherwise present a problem. X-ray fluorescence: If the electron has enough energy it can knock an orbital electron out of the inner electron shell of a metal atom, and as a result electrons from higher energy levels then fill up the vacancy and X-ray photons are emitted.
So the resulting output of a tube consists of a continuous bremsstrahlung spectrum falling off to zero at the tube voltage, plus several spikes at the characteristic lines.
In medical diagnostic applications, the low energy (soft) X-rays are unwanted, since they are totally absorbed by the body, increasing the dose.
To generate an image of the cardiovascular system, including the arteries and veins (angiography) an initial image is taken of the anatomical region of interest. A specialized source of X-rays which is becoming widely used in research is synchrotron radiation, which is generated by particle accelerators. The most commonly known methods are photographic plates, photographic film in cassettes, and rare earth screens. Before the advent of the digital computer and before invention of digital imaging, photographic plates were used to produce most radiographic images.
Since photographic plates are sensitive to X-rays, they provide a means of recording the image, but they also required much X-ray exposure (to the patient), hence intensifying screens were devised.
Areas where the X-rays strike darken when developed, causing bones to appear lighter than the surrounding soft tissue. Contrast compounds containing barium or iodine, which are radiopaque, can be ingested in the gastrointestinal tract (barium) or injected in the artery or veins to highlight these vessels.
An increasingly common method is the use of photostimulated luminescence (PSL), pioneered by Fuji in the 1980s.
The PSP plate can be reused, and existing X-ray equipment requires no modification to use them.
For many applications, counters are not sealed but are constantly fed with purified gas, thus reducing problems of contamination or gas aging. Some materials such as sodium iodide (NaI) can "convert" an X-ray photon to a visible photon; an electronic detector can be built by adding a photomultiplier.
I feel strongly that everyone should have easy access to accurate information about contraception, and my experience has been that learning about my own physiology and being an active participant in preventing or achieving pregnancy can be truly an empowering experience.
My first exposure to Fertility Awareness (FA) as a method for planning or preventing pregnancy was through attending Catholic school starting in sixth grade.
When I learned about Fertility Awareness in depth in nursing school, I was completely fascinated by the fact that simply by paying attention to changes in cervical mucus (CM) and tracking basal body temperature (BBT), women can quite accurately know when they are ovulating. Effective as a combination method to use with other contraceptive measures (particularly barrier methods like condoms or a diaphragm and spermicides, which do not interfere with ovulation like hormonal birth control). Fortunately, whether you're trying to avoid or achieve pregnancy, the technique is the same: monitor BBT once per day (when you first wake up in the morning, before getting up) and notice changes in cervical mucus throughout your cycle. You will notice that for the days of your cycle before you ovulate, your BBT will stay pretty consistent (within a range which is normal for you).
If the egg is fertilized after ovulation, your BBT will stay high as it was just after you ovulated. During the fertile period of the reproductive cycle, the mucus the cervix produces changes from clear and thin or creamy to thick and sticky (resembling egg whites).


Cervical Mucus can be monitored one of two ways: by inserting the fingers into the vagina to retrieve some mucus, or by simply observing the mucus that is wiped away when using the toilet.
Another fertility marker that can be monitored while checking cervical mucus is the position of the cervix.
This method doesn't alter my body chemistry in any way; it works with what my body is doing naturally.
It can be taught to women in developing countries as an effective method of controlling family size. It's not great for people who don't have a regular cycle (which doesn't vary much in length). It can be hard to remember to consistently take your temperature at the same time every morning. It's not a good method for people who do shift work or who don't have a regular sleep-wake schedule. This process produces an emission spectrum of X-ray frequencies, sometimes referred to as the spectral lines.
The intensity of the X-rays increases linearly with decreasing frequency, from zero at the energy of the incident electrons, the voltage on the X-ray tube. A second image is then taken of the same region after iodinated contrast material has been injected into the blood vessels within this area. The contrast compounds have high atomic numbered elements in them that (like bone) essentially block the X-rays and hence the once hollow organ or vessel can be more readily seen.
In modern hospitals a photostimulable phosphor plate (PSP plate) is used in place of the photographic plate. I wrote this post about the fertility awareness a couple of years ago, but was inspired to publish it here today after chatting with a friend who has been trying to conceive for a while. Part of my health education in high school was to learn about the female reproductive cycle and how to read and interpret its signs to help prevent unplanned pregnancy, or to achieve pregnancy when desired (after marriage, of course).
The FA method works best for women who have regular cycles (which don't vary a lot in length from month to month) and also who have no other concerns when it comes to their reproductive health (like PCOS, trouble with infertility, etc). On the day you ovulate, you may notice a slight drop in your BBT, and then there will be a sharp incline the day after you ovulate. If your chart looks like that and you've missed your period, it's likely that you're pregnant.
The term "egg white cervical mucus" (EWCM) is used to describe this thick, stretchy mucus that accompanies ovulation. Either way, noticing the changes in the CM can help you to know when your fertile time is getting near.
Just before ovulation, the cervix generally is in a lower position in the vagina than during the infertile parts of the cycle. Jaymz and I effectively used this method before I became pregnant with Daniel, and when we were ready to become parents, I was already familiar with my cycle, and we knew when the best time was to try to get pregnant. It's gotten to the point where I'm always aware of what stage of my cycle my body is in, and I like having that information. I like knowing I'm able to have more information about what's going on in my body, and I enjoy tracking it from month to month to see the patterns emerge. I never liked the idea of taking hormonal birth control, and I also wasn't a fan of how it made me feel. For a while after I stopped taking hormonal birth control, my cycle was very irregular and I was unable to confidently use the FA method during that time. Hopefully after a while, it becomes routine, but at first it can be hard to think of doing when you're groggy first thing in the morning. Remembering to do it, writing down the temperature (on paper or in a tracking system), etc. The spectral lines generated depend on the target (anode) element used and thus are called characteristic lines.


These two images are then digitally subtracted, leaving an image of only the iodinated contrast outlining the blood vessels. Photographic film largely replaced these plates, and it was used in X-ray laboratories to produce medical images. In the pursuit of a non-toxic contrast material, many types of high atomic number elements were evaluated. After the plate is X-rayed, excited electrons in the phosphor material remain "trapped" in "colour centres" in the crystal lattice until stimulated by a laser beam passed over the plate surface.
Electrons accelerate toward the anode, in the process causing further ionization along their trajectory.
Jaymz and I had some difficulty conceiving the second time around, and charting my basal body temperature with the FA method during that journey helped me to know when something was off in my body and I needed to visit with my midwife. If you are trying to achieve pregnancy, FA will help you to know when you are ovulating, which is the best time to have intercourse if you want to get pregnant. If the egg isn't fertilized during this cycle, your BBT will fall again just before you get your period, which begins your next cycle. Just before ovulation, the amount of EWCM will be at its greatest (providing a favorable environment for sperm to live).
This is something you'll have to get to know over time: If you've never felt your cervix before, you might not know what its current position is relative to other points in your cycle.
We were lucky enough to get pregnant during the first cycle we were not preventing pregnancy.
When I used to work 7PM-7AM three nights per week, my data wasn't as accurate because my sleep schedule wasn't standard all the time.
I've enjoyed being able to get to know my body better over the years by practicing this method of pregnancy prevention.
Please trust your personal judgement and the advice of your healthcare providers when it comes to making decisions about your health. The radiologist or surgeon then compares the image obtained to normal anatomical images to determine if there is any damage or blockage of the vessel.
In more recent years, computerized and digital radiography has been replacing photographic film in medical and dental applications, though film technology remains in widespread use in industrial radiography processes (e.g. For example, the first time the forefathers used contrast it was chalk, and was used on a cadaver's vessels. This process, known as a Townsend avalanche, is detected as a sudden current, called a "count" or "event".
After some blood tests revealed that my progesterone levels were low, I was able to make some changes that ultimately led to getting pregnant with Joel.This post contains frank discussion of reproductive health, physiology, and sexuality. When the film is developed, the parts of the image corresponding to higher X-ray exposure are dark, leaving a white shadow of bones on the film. Always take your temperature via the same route (whether you choose orally, rectally, or vaginally) to get consistent results. Photographic plates are mostly things of history, and their replacement, the "intensifying screen", is also fading into history.
The metal silver (formerly necessary to the radiographic & photographic industries) is a non-renewable resource. Thus it is beneficial that this is now being replaced by digital (DR) and computed (CR) technology. Where photographic films required wet processing facilities, these new technologies do not.



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