# iDCalc

> Medical app for radiation therapy and nuclear medicine computations. (iPhone/iPad app by Mevis Informática Médica Ltda..)

- Source: https://appshunter.io/ios/app/idcalc/id556863722 (this page in markdown: same URL + `.md`)
- Developer: [Mevis Informática Médica Ltda.](https://appshunter.io/developer/556863725)
- Category: Medical, Education
- Price: $2.99
- Rating: 5.00/5 from 2 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 2 MB
- Languages: American English
- Released: 2012-09-07
- Data updated: 2026-08-14
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/idcalc/id556863722/reviews.md

## What is iDCalc?

iDCalc is an application oriented to radiotherapists and medical physicists. It helps with several routine computations used in radiation therapy and nuclear medicine. 

Features:

- iDCalc is able to translate between several Radiation Quality specification indexes.  There is support for the following specifications:  TPR 20/10, D20/D10, Depth of the 80% isodose for a 10x10 cm field (D80), Nominal Energy in megavolts (MV), Percent Depth Dose at 10 cm of depth in water (PDD10) and Linear Attenuation Coefficient.  The user enters a beam quality specification and iDCalc computes its equivalent using all other indexes.

- Computes the decay of frequently used isotopes from a calibration date to any future or present day.  

- Computes the Equivalent Square for rectangular fields for most relevant clinical field sizes. It also computes the Equivalent Square of fields with circular cross sections and the circular equivalent of a rectangular field.

- iDCalc has a built-in library of typical radiation beams with nominal energies from 2 MV to 50 MV.  From this library the user can compute Percent Depth Dose (PDD) and Normalized Peak Scatter Factor (NPSF) for any energy in the valid quality range using d80 as the index to enter beam energy. The PDD can be computed for different field size, source to skin distance and depth.

## Key features

- Radiation quality specification translation
- Isotope decay calculation
- Equivalent square field computation
- Percent Depth Dose (PDD) calculation
- Normalized Peak Scatter Factor (NPSF) calculation
- Built-in library of radiation beams

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/idcalc/id556863722/reviews.md

### 5/5 — Excelent tool for Medical Physicists

*2025-04-02*

Provides PDD for Co-60 and LINAC in the range of 4 - 25 MV of photons. Decay for several isotopes of frequent use in brachytherapy and Nuclear Medicine. Square-Field equivalence for rectangular and circular fields.  TMR for the same energies covered on the PDD already mentioned.  Energy quality relations like PDD10, TPR20/10, D20/D10, Stopping-Power (Sw-air).

### 5/5 — IDCalc

*2012-09-15*

Excelente

### 4/5 — Prático

*2012-09-07*

Ótima ferramenta para uso diário em radioterapia, facilita bastante nosso trabalho. Recomendo!

## Frequently asked questions about iDCalc

### What is iDCalc used for?

iDCalc is designed for radiotherapists and medical physicists to perform routine computations in radiation therapy and nuclear medicine. It helps with translating radiation quality specifications, calculating isotope decay, and determining equivalent square fields.

### What radiation quality specifications does iDCalc support?

iDCalc supports translation between TPR 20/10, D20/D10, D80, Nominal Energy (MV), PDD10, and Linear Attenuation Coefficient. You can input one specification and compute its equivalent using all others.

### Can iDCalc calculate isotope decay?

Yes, iDCalc can compute the decay of frequently used isotopes from a calibration date to any future or present day.

### Does iDCalc help with field size calculations?

Yes, iDCalc computes the Equivalent Square for rectangular fields and circular fields, as well as the circular equivalent of a rectangular field.

### What is the price of iDCalc?

iDCalc is a paid application, priced at $2.99. It does not feature in-app purchases or advertisements.

### On which devices can iDCalc be used?

iDCalc is available for iPhone and iPod devices, as indicated by its supported devices list.

### How often is iDCalc updated?

The latest version of iDCalc is 2.4, and it was last updated on December 13, 2025. This suggests a relatively recent update cycle.

### What is the age rating for iDCalc?

iDCalc has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 2.4 — 2025-12-13

Age rating updated.

### 2.3 — 2025-04-02

Compatibility update for latest versions of iOS.

### 2.2 — 2020-01-22

Compatibility update for iOS 13.
Minor user interface issues corrected.

### 2.1 — 2016-11-12

Compatibility update for iOS 10.
New isotopes added: Co-57,  F-18, Ga-67, Ga-68, I-123, In-11, and Mo-99.
Bibliographic references added.

### 2.0 — 2013-11-14

Completely redesigned for iOS 7.
New isotopes added: Pd-103 and Ru-106.
New feature: Properties Air Kerma Rate Constant, Exposure Rate Constant and Energy of emitted radiation available for each isotope.

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All apps by Mevis Informática Médica Ltda.: https://appshunter.io/developer/556863725

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-14.*