request = {
    calculate: target, // target is "scattering" or "activation" or "all"
    sample: '',        // Material
    flux: '100000',    // Thermal flux
    Cd: '0',           // Cd ratio
    fast: '0',         // Thermal/fast ratio
    mass: '0',         // Mass
    exposure: '1',     // Time on beam
    rest: '[0,1,24,360]', // Time off beam
    density: '0',      // Density
    thickness: '1',    // Thickness
    wavelength: '1',   // Source neutrons
    xray: 'Cu Ka',     // Source Xrays
    decay: '0.001',    // target for "Time to decay below"
    abundance: 'IAEA'  // natural abundance tables (IAEA or NIST)
}

response = {
    'success': True,
    'sample': {
        'name': sample,
        'formula': str(chem),
        'mass': mass,
        'density': chem.density,
        'thickness': thickness,
        'natural_density': chem.natural_density
    }
    'activation': {  // if calculate is 'activation' or 'all'
        'flux': fluence,
        'fast': fast_ratio,
        'Cd': Cd_ratio,
        'exposure': exposure,
        'rest': rest_times,
        'activity': [
            {
                'isotope': el.isotope, 'reaction': el.reaction,
                'product': el.daughter, 'halflife': el.Thalf_str,
                'comments': el.comments, 'levels': activity_el,
            }
            // ...
        ],
        'total': total,
        'decay_level': decay_level,
        'decay_time': decay_time
    }
    'scattering': { // if calculate is 'scattering' or 'all'
        'neutron': {
            'wavelength': wavelength,
            'energy': nsf.neutron_energy(wavelength),
            'velocity': nsf.VELOCITY_FACTOR/wavelength
        },
        'xs': {'coh': xs[0], 'abs': xs[1], 'incoh': xs[2]},
        'sld': {'real': sld[0], 'imag': sld[1], 'incoh': sld[2]},
        'penetration': penetration,
        'transmission': 100*exp(-thickness/penetration)
    }
    'xray_scattering': { // if calculate is 'scattering' or 'all'
        'xray': {
            'wavelength': xray_wavelength,
            'energy': xsf.xray_energy(xray_wavelength)
        },
        'sld': {'real': xsld[0], 'imag': xsld[1]}
    }
}

response = {
    'success': False,
    'error': 'unexpected exception',
    'detail':{'query': stack traceback}
}

$ curl -s -d "sample=Co" -X POST https://www.ncnr.nist.gov/cgi-bin/nact.py | python -m json.tool
{
    "sample": {
        "name": "Co",
        "density": 8.9,
        "natural_density": 8.9,
        "thickness": 1.0,
        "mass": 1.0,
        "formula": "Co"
    },
    "activation": {
        "flux": 100000.0,
        "decay_level": 0.001,
        "total": [
            0.5088248094656863,
            0.009706843055148993,
            1.550197781340068e-05,
            1.5423998799711213e-05
        ],
        "rest": [
            0,
            1,
            24,
            360
        ],
        "activity": [
            {
                "reaction": "act",
                "product": "Co-60",
                "halflife": "5.272 y",
                "comments": "s for 10m isomer added to ground state",
                "levels": [
                    1.550756280503848e-05,
                    1.5507330056885684e-05,
                    1.5501977813400642e-05,
                    1.5423998799711213e-05
                ],
                "isotope": "Co-59"
            },
            {
                "reaction": "act",
                "product": "Co-60m+",
                "halflife": "10.5 m",
                "comments": "",
                "levels": [
                    0.5088093019028804,
                    0.009691335725091536,
                    2.6450954673146495e-42,
                    0.0
                ],
                "isotope": "Co-59"
            },
            {
                "reaction": "2n",
                "product": "Co-61",
                "halflife": "1.65 h",
                "comments": "Co-61 prod from Co-60m only",
                "levels": [
                    7.306767120646388e-16,
                    4.800459878001244e-16,
                    3.055674902007567e-20,
                    1.5291619557875176e-81
                ],
                "isotope": "Co-59"
            },
            {
                "reaction": "2n",
                "product": "Co-61",
                "halflife": "1.65 h",
                "comments": "Co-61 prod assuming all Co-60m has decayed to Co-60",
                "levels": [
                    1.3649499897275873e-16,
                    8.967560554449202e-17,
                    5.7081926346341585e-21,
                    2.8565705754412276e-82
                ],
                "isotope": "Co-59"
            }
        ],
        "exposure": 1.0,
        "decay_time": 1.5773675158317233,
        "fast": 0.0,
        "Cd": 0.0
    },
    "scattering": {
        "sld": {
            "real": 2.2645416201426363,
            "imag": 0.009403091502484154,
            "incoh": 5.632988294016107
        },
        "xs": {
            "coh": 0.07085810248318081,
            "abs": 1.8806183004968307,
            "incoh": 0.43843639843243204
        },
        "penetration": 0.4184253079898973,
        "neutron": {
            "wavelength": 1.0,
            "energy": 81.80420235572412,
            "velocity": 3956.0339760560055
        },
        "transmission": 9.163767420488476
    },
    "xray_scattering": {
        "xray": {
            "wavelength": 1.5418,
            "energy": 8.041522080237366
        },
        "sld": {
            "real": 63.020248367719645,
            "imag": 9.14097379704212
        }
    },
    "success": true
}