Use of X-ray film: technical discussion with example images

What is primary and secondary emulsion?

I am just reading data sheets for Kodak and Carestream mamography film and they speak about facing the primary emulsion to the luminescent screen. I thought mamography film is always coated only on a single side of the support, but it seems not to be always so. (Thy speak also of doouble coating and I first thought it could be that the one side is coated with two layers of emulsion, but it seems not.)

Kodak states:

Quote:

---

The primary emulsion appears flat (dull) while the secondary emulsion has been given a shinier, browner appearance. The primary emulsion images the breast parenchyma up to an optical density of 3.0. The backside (secondary) emulsion crosses over to image the upper density and D-Max. The emulsions are different speed and composition so no interactions will occur

---

What means for us the difference between primary and secondary emulsion?

Links please

Quote:

---

Originally Posted by Eugen Mezei

What is primary and secondary emulsion?

I am just reading data sheets for Kodak and Carestream mamography film and they speak about facing the primary emulsion to the luminescent screen. I thought mamography film is always coated only on a single side of the support, but it seems not to be always so. (Thy speak also of doouble coating and I first thought it could be that the one side is coated with two layers of emulsion, but it seems not.)

Kodak states:


What means for us the difference between primary and secondary emulsion?

---

I dont have the link, it is a PDF, Kodak publication.

This thread is 12 years old, I think I read it all

The only way to learn ANY film is to test for yourself

I process KODAK Carestream, Fuji X-Ray double sided and single side on hangers, Rodinol 1/100 68 f active agitation 7 minutes, water stop, TF5 fix

Hope this helps

Quote:

---

Originally Posted by Eugen Mezei

I dont have the link, it is a PDF, Kodak publication.

---

Which Carestream do you use?

I have always bought X-Ray ANALOG film from this Iowa distributor ZZ Medical, they only sell in date fresh film

They have changed to only case lots of KODAK aka Carestream

I just bought my last supply of X-Ray from ZZ, a case of FUJI ANALOG
for a project

All Medical X-Ray seems to be going out of production, as Digital takes over, some industrial uses survive

If you are just testing, buy this https://www.zzmedical.com/analog-x-r...-ray-film.html

All X-Ray requires a careful touch when wet

Since it is so cheap, play with it and try everything

I cut it down to many sizes, including Hasselblad

Quote:

---

Originally Posted by Eugen Mezei

Which Carestream do you use?

---

Great answer to my question.

This pictogram is printed onto the back of Carestream (and Kodak) X-ray film packs. Can somebody explain to me what it means? Obviously I have never opened a pack. What does avait me? Are the sheets individually packed in a foil that needs to be opened? And than put back in the bag?

Attachment 219597

Quote:

---

Originally Posted by Eugen Mezei

This pictogram is printed onto the back of Carestream (and Kodak) X-ray film packs. Can somebody explain to me what it means? Obviously I have never opened a pack. What does avait me? Are the sheets individually packed in a foil that needs to be opened? And than put back in the bag? Attachment 219597

---

I think it means to close up the pack when done. It just shows a light tight way to fold the package. I’ve never used the Carestream stuff, but Fuji does not come in the plastic bags that are so common with LF photo film. Instead it comes in a sealed paper pack. You tear off the top to pull film and it doesn’t have as much extra as the plastic that film comes in, so you have to be a little careful how you reseal the bag.

I use scissors

but it is designed to be tear off

watch out as it is easy to slide the whole 100 sheets out

I bet X-Ray film was then transferred to a dispenser

I use a paper safe