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This is really cool, Nick! Thanks for sharing! Da I may send emails outside your work hours, but please reply whenever it works best for you. From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+da. zhang=childrens. harvard. edu@ lists. osu. edu></div>
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<p class="MsoNormal"><span style="font-size:11.0pt">This is really cool, Nick! Thanks for sharing!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Calibri",sans-serif">Da</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black">I may send emails outside your work hours, but please reply whenever it works best for you.</span></i><span style="font-size:12.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+da.zhang=childrens.harvard.edu@lists.osu.edu>
<b>On Behalf Of </b>Bevins, Nick B via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Thursday, June 4, 2026 10:44<br>
<b>To:</b> DxMedPhys List <intl_dxmedphys_wd_osu_list@lists.osu.edu><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Gafchromic film [EXTERNAL]<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">If you want to make your own rulers (different widths, lengths, film size, etc.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">),
here’s the script I used to generate the PDFs that Thor sent. You’ll need to download GLE to run the script. I strongly recommend using a few pieces of 11x17 paper<o:p></o:p></span></p>
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<p class="MsoNormal"><strong><span style="font-family:"Helvetica Neue";color:white">* External Email - Caution *</span></strong><span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:11.0pt">If you want to make your own rulers (different widths, lengths, film size, etc.), here’s the script I used to generate the PDFs that Thor sent. You’ll need to download GLE to run
the script. <br>
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I strongly recommend using a few pieces of 11x17 paper cut down to match the film size and running a few test prints. The mammo-sized rulers fit nicely inside an Altoids Smalls tin (which also helps to shield them from light).
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-Nick<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Noto Sans",sans-serif">Nicholas Bevins, Ph.D., FAAPM, DABR, CIIP</span></b><span style="font-size:8.0pt;font-family:"Noto Sans",sans-serif"><br>
Imaging Physicist and Associate Radiation Safety Officer<br>
Maine Medical Center<br>
w 207-662-4276 | p 207-758-0292<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Noto Sans",sans-serif"><a href="mailto:nick.bevins@mainehealth.org">nick.bevins@mainehealth.org</a></span><span style="font-size:8.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu</a>>
<b>On Behalf Of </b>Bjarnason, Thor [IH] via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> Wednesday, June 3, 2026 6:19 PM<br>
<b>To:</b> DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Gafchromic film<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi All, Someone posted these a while ago on this mailing list. I have printed one of these out (I forget which one now!) using a laser printer on the film and it
came out as an accurate ruler! And then ya, I cut off strips as I need them. I<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hi All, Someone posted these a while ago on this mailing list. I have printed one of these out (I forget which one now!) using a laser printer on the film and it
came out as an accurate ruler! And then ya, I cut off strips as I need them. I<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif">Someone posted these a while ago on this mailing list. I have printed one of these out (I forget which one now!) using a laser printer on the film and it came
out as an accurate ruler! And then ya, I cut off strips as I need them.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif">I have about 10 sheets and I think I should be good for the rest of my career … So my caution would only be to not order too big of a box…<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman",serif">Kind regards,</span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman",serif"> </span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman",serif">Thor Bjarnason, PhD, PEng, FCCPM</span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman",serif">Medical Physicist</span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman",serif">Interior Health, Kelowna, BC
</span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:11.0pt;font-family:"Times New Roman",serif">Office: (250) 980-6157 | Mobile: (250) 826-0722
</span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Times New Roman",serif"><a href="mailto:Thor.Bjarnason@interiorhealth.ca">Thor.Bjarnason@interiorhealth.ca</a></span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"> </span><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces@lists.osu.edu</a>>
<b>On Behalf Of </b>Peter Watson, Mr via Intl_dxmedphys_wd_osu_list<br>
<b>Sent:</b> 03 June 2026 9:10 AM<br>
<b>To:</b> Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>>; Douglas Pfeiffer <<a href="mailto:xraydoug@me.com">xraydoug@me.com</a>><br>
<b>Cc:</b> DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Gafchromic film<o:p></o:p></span></p>
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<b><span style="font-size:12.0pt;color:#222222">Caution:</span></b><span style="font-size:12.0pt;color:#222222"> This email originated from outside of Interior Health. Do not click links or open attachments unless you recognize the sender, their email address,
and know the content is safe. If you suspect this is a phishing or fraudulent email please forward it to
<a href="mailto:spam@interiorhealth.ca">spam@interiorhealth.ca</a>. <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span lang="EN-GB" style="font-size:1.0pt;color:white">I've got some old XR-QA2 films that I've been parsimonious with, they are still quite dose sensitive after nearly a decade! I wish they still made
this model (good contrast at ~1 mGy, vs the nearly 20 mGy needed for LD-V1). Peter Watson, PhD,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">I've got some old XR-QA2 films that I've been parsimonious with, they are still quite dose sensitive after nearly a decade! I wish they still made this model (good contrast at ~1 mGy,
vs the nearly 20 mGy needed for LD-V1).<o:p></o:p></span></p>
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<p class="elementtoproof"><span lang="EN-GB" style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black">Peter Watson, PhD, MCCPM</span><span lang="EN-GB" style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="elementtoproof"><span lang="EN-GB" style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black">Medical Physicist, McGill University Health Centre</span><span lang="EN-GB" style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="elementtoproof"><span lang="EN-GB" style="font-size:12.0pt;font-family:"Calibri",sans-serif;color:black">Assistant Professor, Medical Physics Unit and Department of Oncology, McGill University</span><span lang="EN-GB" style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">From:</span></b><span lang="EN-GB" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list-bounces+peter.watson=mcgill.ca@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces+peter.watson=mcgill.ca@lists.osu.edu</a>>
on behalf of Douglas Pfeiffer via Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Sent:</b> June 3, 2026 11:32 AM<br>
<b>To:</b> Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>><br>
<b>Cc:</b> DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
<b>Subject:</b> Re: [Intl_DxMedPhys] Gafchromic film</span><span lang="EN-GB" style="font-size:12.0pt">
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span lang="EN-GB" style="font-size:1.0pt;color:white">Precisely. In mammography, just need to remember to protect the detector. Best regards, Doug Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him) Medical
Physicist, Radiation Safety Officer Boulder Community Health xraydoug@</span><span lang="EN-GB" style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span lang="EN-GB" style="font-size:1.0pt;color:white">me.</span><span lang="EN-GB" style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span lang="EN-GB" style="font-size:1.0pt;color:white">com
303.</span><span lang="EN-GB" style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span lang="EN-GB" style="font-size:1.0pt;color:white">415.</span><span lang="EN-GB" style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span lang="EN-GB" style="font-size:1.0pt;color:white">7515
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt">Precisely. In mammography, just need to remember to protect the detector.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">Best regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">Doug<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">Douglas Pfeiffer, MS, DABR FACR, FAAPM (he/him)<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">Medical Physicist, Radiation Safety Officer<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">Boulder Community Health<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black"><a href="mailto:xraydoug@me.com">xraydoug@me.com</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">303.415.7515<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt;color:black">The opinions expressed in this message are the product of the gray and white matter loitering in my cranium. I speak for myself and no one else, unless I say otherwise.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt">On Jun 3, 2026, at 9:31</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span><span lang="EN-GB" style="font-size:12.0pt">AM, Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>>
wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB" style="font-size:12.0pt">Yep, but for stuff like measuring CT beam collimation it doesn't matter. Crank up the mAs to get a good image, then take an image at half the mAs to use as a reference
for FWHM. Sensitivity and fog level shouldn't matter<br>
<br>
<br>
Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™)<br>
Medical Physicist<br>
RJK Medical Physics, Inc.<br>
440-463-7879<br>
<br>
-----Original Message-----<br>
From: Douglas Pfeiffer <<a href="mailto:xraydoug@me.com">xraydoug@me.com</a>> <br>
Sent: Wednesday, June 3, 2026 11:06 AM<br>
To: Nicole Ranger <<a href="mailto:nicoletranger@yahoo.com">nicoletranger@yahoo.com</a>><br>
Cc: Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>>; DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
Subject: Re: [Intl_DxMedPhys] Gafchromic film<br>
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Yup. It just loses sensitivity, in my experience.<br>
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<br>
Doug<br>
-------------<br>
Sent from my iPhone - please excuse any typos that slip through!<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB" style="font-size:12.0pt">On Jun 3, 2026, at 9:01</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span><span lang="EN-GB" style="font-size:12.0pt">AM, Nicole
Ranger via Intl_dxmedphys_wd_osu_list <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>> wrote:<br>
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</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Tahoma",sans-serif"></span><span lang="EN-GB" style="font-size:12.0pt">Thanks Bob. I used large sheets in the past to assess skin dose distributions in fluoro procedures and the results were informative
but baselines mattered there. Glad to know the consensus is that they can be used almost indefinitely for QC.<br>
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Nicole<br>
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Sent from my iPhone<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt">On Jun 3, 2026, at 11:55</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Arial",sans-serif"> </span><span lang="EN-GB" style="font-size:12.0pt">AM, Bob Kobistek <<a href="mailto:bob@rjkmedphys.com">bob@rjkmedphys.com</a>>
wrote:<br>
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</span><span lang="EN-GB" style="font-size:12.0pt;font-family:"Tahoma",sans-serif"></span><span lang="EN-GB" style="font-size:12.0pt">I'd say as long as you can see a useable image, keep using the film. I left some sheets in my hot car over last summer. The
sheets are much darker than new sheets, but I'm still using them for CT collimation testing. I can even scan and locate the FWHM with no problems.<br>
<br>
<br>
Robert J. Kobistek, MS, FACR, DABR, MRSE(MRSC™) Medical Physicist RJK <br>
Medical Physics, Inc.<br>
440-463-7879<br>
<br>
-----Original Message-----<br>
From: Intl_dxmedphys_wd_osu_list <br>
<<a href="mailto:intl_dxmedphys_wd_osu_list-bounces+bob=rjkmedphys.com@lists.osu.edu">intl_dxmedphys_wd_osu_list-bounces+bob=rjkmedphys.com@lists.osu.edu</a>>
<br>
On Behalf Of Nicole Ranger via Intl_dxmedphys_wd_osu_list<br>
Sent: Wednesday, June 3, 2026 9:33 AM<br>
To: DxMedPhys List <<a href="mailto:intl_dxmedphys_wd_osu_list@lists.osu.edu">intl_dxmedphys_wd_osu_list@lists.osu.edu</a>><br>
Subject: [Intl_DxMedPhys] Gafchromic film<br>
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Good morning list,<br>
<br>
I’ve used Gafchromic film extensively in the past in a dosimetry context where cumulative exposure during storage was important but for the Gafchromic that you use for imaging QC purposes (CT, Mammo, etc…) where the baseline exposure is less important so long
as there is adequate contrast, what would you consider to be a useful timeframe before the film is less useful? Just wondering if there is any downside when buying a box. We have relatively fewer devices here than I have had to support in the past so I’m
not sure how quickly I will go through this stuff.<br>
<br>
TIA<br>
Nicole<br>
<br>
<br>
Sent from my iPhone<o:p></o:p></span></p>
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