Understanding the Total Radiation Dose in Industrial Radiography

How much total dose will be received by a radiographer after making 24 exposures at 30 mR/h for 5 minutes each?

• A. 60 mR (600 μSv)
• B. 30 mR (300 μSv)
• C. 120 mR (1200 μSv)
• D. 15 mR (150 μSv)

Answer: (A)

To determine the total dose received by the radiographer after making 24 exposures at a dose rate of 30 mR/h for 5 minutes each, we need to perform a few calculations. First, we calculate the dose received during each individual exposure. Since the exposure time is 5 minutes, we convert this time to hours for our dose rate calculation: 5 minutes = 5 / 60 hours = 1/12 hours. Given that the dose rate is 30 mR/h, we can calculate the dose for one exposure using the dose formula: Dose = Dose Rate × Time. Substituting in the values: Dose for one exposure = 30 mR/h × (1/12) h = 2.5 mR. Now, since there are 24 exposures in total, we multiply the dose received from one exposure by the number of exposures: Total Dose = Dose per exposure × Number of exposures Total Dose = 2.5 mR × 24 = 60 mR. This results in a total dose of 60 mR, which is equivalent to 600 μSv. This is how the correct answer is derived.

When it comes to the world of industrial radiography, understanding your exposure to radiation isn’t just a dry calculation—it’s a crucial component of keeping both health and safety in check. So, how do you figure out the total dose a radiographer receives? Let’s walk through a common scenario, shall we?

Imagine you're a radiographer on the job, preparing to make 24 exposures at a dose rate of 30 mR/hour, each lasting 5 minutes. You might think, "How much radiation am I actually absorbing during this time?" It’s a valid question and one worth calculating, because knowing your exposure is vital to maintaining a safe work environment.

To break it down, we first need to convert how long each exposure lasts into hours. After all, our dose rate operates on an hourly basis:

• 5 minutes = 5 / 60 hours = 1/12 of an hour.

Simple enough, right? Now, with our dose rate of 30 mR/hour, we can put this into our handy dose formula:

• Dose = Dose Rate × Time.

Plugging in our variables, we get:

• Dose for one exposure = 30 mR/h × (1/12) h = 2.5 mR.

Now, it’s time to scale up. Since you're conducting 24 exposures, you multiply the dose from one exposure by the total number of exposures:

• Total Dose = Dose per exposure × Number of exposures.

• Total Dose = 2.5 mR × 24 = 60 mR.

And there you have it! The total dose received after all those exposures is 60 mR, which is also 600 μSv when converted. Knowing this is more than just math; it bears real implications for your health and safety practices.

As a radiographer, you may wonder, "Why is this knowledge so pivotal?" Well, aside from keeping exposure limits in check, it gives you the power to ensure compliance with safety regulations and protect those around you—whether they're workers, technicians, or even your own family. Understanding these measurements helps enact better protocols, reducing risks day by day.

So, what's the takeaway? Mastering these fundamentals not only boosts your confidence in the field, but it also elevates workplace safety. Feel free to mull over these numbers and scenarios as you prep for your ASNT Industrial Radiography assessment. You know what? It might just transform how you view your daily responsibilities as a radiographer.