Which of the following structures in the body is most sensitive to radiation VTNE?
The lens of the eye is considered one of the most radiation-sensitive structures in the body.
How often should the chemicals be changed in a manual developing system?
every three to four weeks
How often should processing tank be cleaned?
Cards
| Term what is latent image | Definition the image we do not see, it appears invisible until chemical processing |
|---|---|
| Term how often does processing tank get cleaned? | Definition every time solutions are changed |
What comes first fixer or developer?
For manual processing, if the film is placed in the developer solution for X amount of time it should be placed in the fixer for 2X and in the final rinse for 3X Page 3 3 3 amount of time.
Why is it important to clean and check the automatic processor daily?
sensitometry, should be performed to ensure the activity level of the chemicals before processing clinical films. Automatic processors should be cleaned regularly and the cross-over rollers should be cleaned each operational day. A draft from a window may cause a fluctuation in the temperature of the chemicals.
How often should the levels of solution in the automatic processor be checked?
Cards
| Term What are the two purposes of film processing? | Definition 1.convert a latent image to a visible image 2.preserve the visible image so that it does not disappear on the radiograph |
|---|---|
| Term How often should processor solution levels be checked? | Definition at the beginning of each day? |
What will happen if the darkroom humidity is less than 40%?
If the humidity is allowed to drop below 40 percent an increase in static marks on the film will usually result. Low or high humidity cause difficult film transport for automatic cassette loaders and film handling systems in the darkroom and for rapid film changers.
How many minutes should you manually develop a radiograph and at what temperature?
5 minutes
What is the time between exposure to radiation and time the effect becomes visible?
Radiology Board Q
| Question | Answer |
|---|---|
| The two types of digital systems include? | Wired ccp and wireless psp |
| What is the time between exposure to radiation and time the effect becomes visible? | Latent period |
| The collar on a lead apron reduces the dose of radiation to the? | Thyroid |
| Another name for target is? | Anode |
What are the steps in film processing?
Film processing, whether it is manual or automatic, comprises five basic steps: (1) developing, (2) rinsing or stop bath, (3) fixing, (4) washing, and (5) drying.
What is the darkroom process?
A darkroom is used to process photographic film, to make prints and to carry out other associated tasks. It is a room that can be made completely dark to allow the processing of the light-sensitive photographic materials, including film and photographic paper.
Why do photographers use red light in a darkroom?
Photographic paper reacts to light to produce the image taken by a camera and stored on film. Darkrooms used red lighting to allow photographers to control light carefully, so that light-sensitive photographic paper would not become overexposed and ruin the pictures during the developing process.
Can you use a red light in a darkroom?
Red (1A) safelight filters are typically used for orthochromatic materials like litho film, certain liquid emulsions and some B&W photo papers. Never mix OC and red safelights in the darkroom — even if a paper can be used with either safelight, the combination will usually cause fogging.
What is the red light used in a darkroom called?
safelight
Can any red light be used in a darkroom?
A safelight is essential in any darkroom, as it provides illumination without affecting the photographic materials. On the other hand, orthochromatic film is only sensitive to blue and green light and can be safely used under a red safelight.
Can I develop film with red light?
The photographic film (even the black and white) is sensitive to almost the whole spectrum of visible light. The film will be ruined if you expose it to red light in a darkroom. In order to transfer the exposed film from its canister to a processing tank, you will need a “changing bag” or a totally dark room.
How safe is safe light?
> No safelight provides completely safe exposure for an indefinite period of time. > Safelight filters are designed for specific types of paper and film. > Safelight filters fade with use. > Poor safelight conditions can produce a loss in photographic quality before actual fogging is visible. >
Can you develop film with a Safelight?
A safelight is not only used for film development, but also when using an enlarger to make prints with trays in a darkroom sink. The enlarging paper sensitivity is not usually effected by the red light as the paper unlike most films is not effected by that light band.
What color light is film not sensitive to?
In addition to visible light, all films are sensitive to ultraviolet light, X-rays and gamma rays, and high-energy particles. Unmodified silver halide crystals are sensitive only to the blue part of the visible spectrum, producing unnatural-looking renditions of some colored subjects.
Why is photographic film sensitive to light?
The sensitive elements in the film are crystals of, most often, silver halide which can change their structure when excited by light (photons). When a photon of light strikes a grain it dissipates its energy in the crystal (grain). This energy may or may not be enough to flip the crystal into a latent state.
What is left behind on the photographic film when it is exposed to sunlight?
The light sensitivity of the silver halides is key to the photographic process. Tiny crystals of all three of these compounds are used in making photographic film. When exposed to light, a chemical reaction darkens the film to produce an image.
What does overexposed film look like?
Overexposed image No shadows exist and there aren’t any highlights other than the blobs of light all over the image. Quite often, you can tell with the naked-eye when an image is overexposed, underexposed, or just right. Underexposed is simply the opposite of overexposed, where the image appears too dark.
How do you know if your exposure is correct?
To determine if you have proper exposure on your digital images check your histogram on the back of your camera after every photo you take. It sounds like a lot of work to do this, but trust me, if your exposure is correct, you will have less “fixing” to do to your images afterward, so really, it’s a time saver.