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X-Ray Timer for Android

Android App Store Link


Now available on Android!  This has been by far my most popular app on iPhone and now it is available for Android also.

This app was modeled after the slide rules that Industrial Radiographers use to estimate their exposure times.

The app has the ability to change between inches and MM, Curies or TBq. It also obviously has a selector for which isotope you are using.

Barricade for Android



An Industrial Radiography Barricade Calculator for double checking your barricade or Restricted Area.

The app calculates four numbers that can be handy when performing radiography. The distance with your collimator and shielding, the distance without them (in case the open end of the collimator is unavoidably pointing towards a barricade, the emergency distance (worse case scenario of no shielding and 2 mR/hr), and also the maximum allowable survey meter reading at the barricade when performing compliance verifications.

The dose rate reading is rounded off at 0.1 precision level so don’t push the readings to the limit. More room is better.

The distances are ALL rounded up to the next whole number if they are not a whole number. For example, 50.001 feet will display as 51 feet. And decimal point whatsoever will cause the answer to be rounded up to the next whole number.

I only have the input for time in Minutes. There is a reason for it. If you have such a short time of exposure that the total amount of all exposures is less than 1 minute, you can afford to round up. The distances will be really short. If you are shooting 5 minutes and 30 seconds I would recommend putting at least 6 minutes in you calculations, if not 7, or 8, or 10.

The same goes with curies. It wouldn’t hurt to over estimate your curies. Complying with the regulations by having a little more barricade than needed is better than having too little.

These calculations are your responsibility and this is just made for you to double check yourself. No responsibility for compliance is accepted.

Ug Calculator for Android

This is an Android version of my iPhone app Ug Calc.

It is only useful for Industrial Radiographers.  It calculates the Geometric Unsharpness (Ug)  of a radiograph.  Geometric Unsharpness is also referred to sometimes as Penumbral Shadow.

The app is straight forward.  You just enter the source side of the object to film distance, the source side of object to source distance, and the diagonal size of the source and hit enter.

The app does not collet any data or talk to the internet.

The link to the app is below.

Link to Ug Calculator for Android

Barricade Version 2.2 in App Store

I have updated my Barricade app to Version 2.2 and it was approved by Apple and is now live in the App Store.

The update was just focused on being recompiled in 64-bit in latest version of X-Code so it could keep working in iOS 11.


X-Ray Timer Version 4 in App Store

Version 4 is live in the app store which fixes the crashing issue in iOS 10.

If the old version is still on your phone it should auto-update.

If you had deleted it you will have to download the latest version.

X-Ray Timer Update Submitted to App Store

I have a working version running locally on my phone and have submitted it to Apple, hopefully it will go through OK.

X-Ray Timer Crashing in iOS 10

I have removed it from the app store for now.

I will try to analyze the issue and decide how to proceed.

I have heard from many users and it is nice to know people are using the app after all these years.

I am swamped with work so I will try to get on it as soon as I can and decide what to do with it.

Sorry for the issue.

Density App removed from App Store Temporarily

I was informed by a user that my Density app wasn’t working.  I confirmed that it would just crash on my phone and refused to run.

I’m not sure what would have caused this to occur but not affect my other apps but I am looking into it.

I pulled it from the app store so new users would not download it in the meantime.


miniLock ID

My miniLock ID is:



You can use this to send me encrypted files.


miniLock is a Google Chrome plug in.


Radiographic Enlargement

I have had a lot of people email and ask about the math formulas to calculate Radiographic Enlargement.

If you look in many of the handbooks and online you will mostly find very complicated formulas.  In reality  it is quite simple and just uses basic ratios.    The formula below is for using a steel comparator ball but the math works the same if regardless.

Actual Pipe Wall = (Actual Ball Diameter ÷ Ball Diameter on Film) X Wall Thickness on Film


Divide the actual ball diameter or the length of the optical comparator by the measured apparent length of the comparitor on the film. Multiply this answer by the pipe wall thickness as measured on the film.

For accurate measurement the ball or comparator block must be put as near as possible to the exact side of the pipe parallel to the film so that the enlargement of the pipe wall is the same as that of the ball of block.

If the comparator or ball is not touching the pipe because of insulation, aim the source at the center of the space between the two, as shown in the drawing below. This will help insure an equal amount of enlargement to the ball and the pipe wall. (Think of how the source side of an elliptical 2” weld is distorted more than the film side)


If using a one inch diameter ball and the diameter measured on the film is actually 1.2 inches and the film wall measured on the film is 0.500”, the actual wall thickness is 0.416 inches.

Pipe Wall = ( 1” ÷ 1.2” ) X 0.500” Pipe Wall = 0.83 X 0.500”
Pipe Wall = 0.416” 




Below is an Excel spreadsheet calculator that you can use.

Radiographic Enlargement Calculator

PDF Version of this article Radiographic_Enlargement