For those needing portability, Rad Pro for Desktop works with Windows 8.1/10 tablets. Will not work with Surface tablets running Windows RT.
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Rad Pro Calculator online performs many nuclear calculations that are useful to the health physicist, radiological researcher, radiochemist, radiation safety officer, health physics technician (HP) and other professionals in radiation physics and radiological engineering. It calculates, among other things, radioactivty units conversions (SI and US customary) and gamma emitter dose rate and activity. 
The software was originally called NukeWorker Calculator.    It can calculate dose and dose rates for many radioactive isotopes such as Co-60 (gamma and beta mR/hr and mrad/hr), Sr-90 (beta mRad/hr), P-32 (beta Gy/hr), Cs-137 (gamma and beta mSv/hr and mGy/hr), Ra-226, Am-241, C-14, H-3, S-35 and I-192. The gamma dose rate calculator also calculates shielding using all of the latest data from NIST (attenuation coefficients) and ANSI (buildup factors). The user may calculate many nuclear equations that are often time consuming and tedious. These calculations are a time saver to the health physics, radiation protection or radiation safety engineer professional (such as RSO). Use this website to perform radioactive decay and half-life equations. Convert radiation activity, dose equivalent abd absorbed dose units such as Gray (Gy), Bequerel (Bq), rad, rem, dpm, sievert (Sv), Curie (Ci), as well as mGy, mrem, mR, mSv, MBq, kBq, mrad, krad, mCi, uCi, pCi and nCi. This site contains three uranium calculators (uranium enrichment calculations, uranium fuel loading calculations and uranium grams calculations). Calculate the distribution of uranium isotopes in new nuclear fuel. The site is used by many government employees in the DOE, NRC and EPA. The user has a choice between the online calculator and a desktop radiation calculator. This site is supported by and featured by NukeWorker. The calculations on this site may be useful to the person assessing cancer risks. This site contains inverse square law calculations for the radiation protection student. The equations on this site are useful to professionals doing remediation and decommissioning projects (D&D, DandD) at nuclear power plants and USDOE sites. Isotopes included on this site are H-3 (3H), Be-7 (7Be), C-11 (11C), C-14 (14C), N-13 (13N), N-16 (16N), O-15 (15O), F-18 (18F), Na-22 (22Na), Na-24 (24Na), P-32 (32P), P-33 (33P), S-35 (35S), Cl-36 (36Cl), Ar-41 (41Ar), K-40 (40K), K-42 (42K), Ca-45 (45Ca), Sc-46 (46Sc), Sc-47 (47Sc), Cr-51 (51Cr), Mn-51 (51Mn), Mn-52 (52Mn), Mn-54 (54Mn), Fe-55 (55Fe), Fe-59 (59Fe), Co-55 (55Co), Co-57 (57Co), Co-58 (58Co), Co-60 (60Co), Cu-61 (61Cu), Cu-62 (62Cu), Cu-64 (64Cu), Cu-67 (67Cu), Ni-63 (63Ni), Zn-62 (62Zn), Zn-65 (65Zn), Ga-64 (64Ga), Ga-67 (67Ga), Ga-68 (68Ga), Ge-68 (68Ge), As-72 (72As), As-74 (74As), Se-72 (72Se), Se-75 (75Se), Br-75 (75Br), Br-77 (77Br), Kr-81m (81mKr), Kr-85 (85Kr), Kr-85m (85mKr), Kr-87 (87Kr), Kr-88 (88Kr), Kr-89 (89Kr), Rb-81 (81Rb), Rb-82 (82Br), Rb-83 (83Br), Sr-85 (85Sr), Sr-89 (89Sr), Sr-90 (90Sr), Sr-92 (92Sr), Y-88 (88Y), Y-90 (90Y), Y-91 (91Y), Zr-89 (89Zr), Zr-95 (95Zr), Nb-94 (94Nb), Nb-95 (95Nb), Mo-99 (99Mo), Tc-96 (96Tc), Tc-99 (99Tc), Tc-99m (99mTc), Ru-97 (97Ru), Ru-103 (103Ru), Ru-106 (106Ru), Pd-103 (103Pd), Pd-109 (109Pd), Rh-105 (105Rh), Ag-108m (108mAg), Ag-110m (110mAg), Cd-109 109Cd), In-111 (111In), In-115m (115mIn), Sn-117m (117mSn), Sb-122 (122Sb), Sb-124 (124Sb), Sb-125 (125Sb), Te-123m (123mTe), Te-127 (127Te), Te-129 (129Te), Te-132 (132Te), I-122 (122I), I-123 (123I), I-124 (124I), I-125 (125I), I-129 (129I), I-131 (131I), I-132 (132I), Xe-127 (127Xe), Xe-131m (131mXe), Xe-133 (133Xe), Xe-133m (133mXe), Xe-135 (135Xe), Xe-135m (135mXe), Cs-130 (130Cs), Cs-131 (131Cs), Cs-134 (134Cs), Cs-137 (137Cs), Ba-131 (131Ba), Ba-133 (133Ba), Ba-137m (137mBa), Ba-140 (140Ba), La-140 (140La), Ce-139 (139Ce), Ce-141 (141Ce), Ce-144 (144Ce), Sm-145 (145Sm), Sm-153 (153Sm), Tb-149 (149Tb), Gd-153 (153Gd), Pr-144 (144Pr), Pm-147 (147Pm), Eu-152 (152Eu), Eu-154 (154Eu), Eu-155 (155Eu), Dy-165 (165Dy), Ho-166 (166Ho), Er-169 (169Er), Yb-169 (169Yb), Tm-170 (170Tm), Tm-171 (171Tm), Lu-177 (177Lu), Ta-178 (178Ta), Ta-179 (179Ta), Ta-182 (182Ta), Re-186 (186Re), Re-188 (188Re), W-187 (187W), W-188 (188W), Ir-192 (192Ir), Ir-191m (191mIr), Os-191 (191Os), Os-194 (194Os), Au-198 (198Au), Tl-201 (201Tl), Pb-203 (203Pb), Pb-210 (210Pb), Pb-212 (212Pb), Pb-214 (214Pb), At-211 (211At), Bi-210 (210Bi), Bi-210m 210mBi), Bi-212 (212Bi), Bi-213 (213Bi), Bi-214 (214Bi), Po-210 (210Po), Rn-220 (220Rn), Rn-222 (222Rn), Ra-223 (223Ra), Ra-224 (224Ra), Ra-226 (226Ra), Ra-228 (228Ra), Ac-225 (225Ac), Ac-227 (227Ac), Ac-228 (228Ac), Th-227 (227Th), Th-228 (228Th), Th-229 (229Th), Th-230 (230Th), Th-232 (232Th), Pa-233 (233Pa), Pa-234 (234Pa), Pa-234m (234mPa), U-232 (232U), U-233 (233U), U-234 (234U), U-235 (235U), U-236 (236U), U-238 (238U), Np-237 (237Np), Pu-238 (238Pu), Pu-239 (239Pu), Pu-240 (240Pu), Pu-241 (241Pu), Am-241 (241Am), Cm-242 (242Cm), Cm-243 (243Cm), Cm-244 (244Cm) and Cf-252 (252Cf).   The x-ray device calculator includes gypsum wallboard (drywall) as a shielding material.  X-ray tube filters include beryllium (Be), Be plus aluminum, aluminum, copper and lead filters.  For now, the empirical calculations are only for constant potential (continuous wave) (Kv or kVCP) generators.  Pulse or pulsating potential (kVP) data was sparse.  N
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